An act of sexual promiscuity. Frowned upon in most cultures and religions.
When having sex, the male obtains a banana, peels it and inserts the banana into the unused orifice of the woman, usually the anus. The male then proceeds to place the banana peel over their penis before having sexual intercourse with the woman. After the male has climaxed, they take the banana out of the woman’s anus and get them to eat it.
"Hey Gregg, what did you get up to last night?"
"I just gave someone a bare bananarama!"
"I just gave a girl a bananarama then used the banana in my custard."
"I had a bananarama last night, it was dirt like."