A green bananer refers to Exhibit A : a male or female who fails to get action. Hence, the banana (Exhibit B) being pursued is unpeeled by the eater (Exhibit A) and thus the banana (B) is too ripe.
"Justin is a true green bananer, that kid hasn't been laid in a year!"
"Watch out Izzy, that guy's a green bananer. He won't last long...."
Uruguayan internetcomedian famous for his defacing of movie trailers into parodies where jokes about sex, drugs, and many other sensible topics are brought to preposterous proportions. Also does parodies about songs, high profile events like the Royal Wedding, and other public interest things.
El bananero is also famous for creating the word "sape", which also turned into his signature word for approval.