Learn English – Bridal shower and Baby shower, what does that even mean

"Yellow bones" is an African American colloquial expression referring to an African American woman with unusually light colored skin.

Bo (slang) is a form of addressing a friend, a boy, a fellow.

1.another name for a friend

2.put in place of a person's name

Hey bo, what's shakin'?

Source: Urban Dictionary

Entry from British & World English dictionary:
bo 3
Pronunciation: /bəʊ/
NOUN

US informal
Used as a friendly form of address.
Origin: Early 19th century: perhaps an abbreviated form of boy.

I first met this word reading P.G.Wodehouse.

“You’re lookin’ kind o’ sick, bo,” was Steve’s comment. “I guess you was hittin’ it up with the gang last night in one of them lobster parlors.” Bailey objected to being addressed as “bo”.