Noun. Sex act. Involving most often a green, unripened (and thusly firm) banana, preferrably microwaved to a warm temperature then gently inserted into a man's anus where it may pleasurably rub against the prostate. After a while, the banana handler begins battering the recipient, making the phallus appear to be a dancing banana.
Hooker: "Sure, sweety, just name a sex act that can happen between two people, and I've done it"
John: "Ever done a dancing banana?"
Hooker: "Only once before, ... back when I was in love. I swore I'd never do it again."
Frat bag: "yeah, brah, that slut got so drunk last night, I convinced her to give me a dancing banana!'
his Brah: "DAYUM DB, that was my sister!"
the funniest damn buddy icon on the internet
All shall hail to the greatness of the dancing banana.