Sometimes in very informal or comic book language one will see phrases such as "bonkity bonk", "flippity-flop", and "knockity knock". Other examples include "crunchity", "swirlity", etc, etc.
I have heard people add the suffix "-ity" to a number of verbs and it always seems to imply a progressive action. For example, "knockity knock" can be used to refer to the action of knocking on a door while it is still happening.
This suffix is different than "-ing" which also shows present progression. It wouldn't sound right to say "knocking knock" or "bonking bonk".
But what IS the difference? And what is the correct term for this suffix?
Best Answer
According to free dictionary, the suffix -ity indicates a state or condition. There are plenty of "formal" words having this suffix also:
(And that is just a sampling of the more common words I found in a search, stopping at f).
So, it seems the intent of knockity is to indicate the state of being knocked. As you suggest, to show that the action is currently taking place.