Learn English – When did students start to “play truant” from school

The OED dates boink as a verb back to 1984, citing Stephen King's Thinner, where it appears to be used as onomatopoeia, similar to bonk:

He half-expected them to begin bopping and boinking each other.

For this sense, the OED gives the definition "to strike, to knock", which is fairly similar to how bonk is used. As for the sexual meaning, their earliest cite is from two years later, a 1986 posting to the newsgroup net.singles by Andrew Tannenbaum:

When you and your honey boink away, you're doing what the doggies do.

Can boink be antedated? Perhaps. But take a look at the following chart from Google Books Ngrams Viewer:

So at the very least, boink wasn't widespread until after the mid-80s.

Searching Google Books, I was able to find some examples of boink from before 1986, but none with a sexual meaning. I chose to search for boinking first to reduce false positives because Google Books (unlike their Ngram Viewer) is case-insensitive and Boink is a name. I did also search for boink, but it was less useful. Searches for boinked and boinks had fewer false positives than boink did, but neither turned up any pre-1986 citations with a sexual meaning.

Most of what I found was like the following snippet from The Complaint Booth (Jack Kurtz, 1978):

Fairies pass through audience boinking people with their wands. Elves up and down aisles "beeping."

Here it seems similar to bonk. And we can find scattered earlier uses with the same meaning, as in the following 1966 use with a similar meaning in Science & Technology:

This causes a mechanical wave to travel around the circumference of the sleeve―in the same way it would if you kept "boinking" the top of a metal can with your fingers.

Using the same tools, Frank found an even earlier example, apparently quoting something Senator John Thye said in a 1947 congressional committee meeting:

Mr. Sears, how would you propose to perfect the general farm program, disregarding soil conservation which is just one small phase of the enter program, but boink back to parity price, the ever-normal granary, and those programs?

There are more like this, but it didn't seem to be especially common and none of the pre-1986 examples I found had a sexual meaning. Of course, that doesn't mean people didn't use it that way, only that I can't find it in print using online tools. It seems likely that the word was used in speech before it appeared in print, but I can only speculate as to how much earlier.

Given the dates, including the citation Frank found, it seems reasonable to guess that boink goes back about as far as bonk. As for the sexual use, it seems safe to say it became commonplace after the mid-80s.

According to The Word Detective get off the dime dates back to the 20's and predates Etymonline 1954 suggestion on stop on a dime. Actually, as shown below, the latter has an older origin, probably from the same period as the former.

• “Get off the dime” has been around since at least the 1920s, and today it’s generally used to mean, as defined by the Historical Dictionary of American Slang, “to take action after a period of indecision or procrastination; to act” (“Congress [should] get off the dime and adopt the … budget proposal before it,” President Ronald Reagan, 1982).

• Since a dime is a small unit of money and fairly easily to come by, this small coin has played a much larger role in US slang than, for instance, the hundred-dollar bill.

• To “drop a dime on someone,” for instance, means to inform on them, usually by tipping off the police, and originated back in the 1960s when a call from a public telephone cost ten cents. “Dime” has also found a home in the slang of drug users, where a “dime” or “dime bag” has long meant ten dollars worth of a drug. The small size of a dime has also been used as a metaphor for “a small spot,” as in “stop on a dime” or “turn on a dime” when speaking of motor vehicles (or politicians).

• “Get off the dime” dates back to the days of dance halls and “taxi dancers,” women employed by the halls to dance with strangers, usually for ten cents per dance (a grim occupation immortalized in the 1930 Rodgers and Hart song “Ten Cents a Dance”).

  • A contemporary account, published in 1925, explains the phrase: “Sometimes a … [dancing] couple would … scarcely move from one spot. Then the floor manager would cry ‘Git off dat dime!'” Similarly, “dancing on the dime” meant to dance very closely with very little movement, behavior that might well attract the attention of the Vice Squad and get the hall closed. Thus “get off the dime” referred both to the the customer as the “dime” he had paid and to the small spot (“dime”) on the floor where the couple seemed frozen.

Actually according to The Dictionary of American Slang, Fourth Edition By HarperCollins get off the dime is:

• (1925+); an alteration of the expression stop on a dime, used to praise the brakes of a car.

Ngram shows usage of the two expressions are from the late 20's/early 30's.

The following extract suggests that they may have come into usage about the same period and in the same context:

• Thanks to Jonathan Lighter's "Historical Dictionary of American Slang," we have the activity that coined the phrase. Carl Van Vechter, one of the earliest modern dance critics and author of the 1926 novel "Nigger Heaven" - a title nobody would use today - described the scene in a taxi-dance hall: "Sometimes a … couple would scarcely move from one spot. Then the floor manager would cry, Git off dat dime!"

• To dance on a dime was to grind bodies tightly together in clothed but sexual contact, without moving from that spot; taxi dancers working for a dime (immortalized in the 1930 Lorenz Hart lyric "Ten Cents a Dance") were exhorted by their bosses to keep the customers moving. Thus, to get off the dime came to mean "to get moving."

(ytlcommunity.com)