Definitions by The Fluffeh!

banananah 

Basically, because a banana and a penis have a lot in common, some people have associated them with each other. Now, when revealing a penis or a penis-shaped object, it will usually be accompanied with an exclamation of "BanananAAAAHH!"

ooh, look, it's a banananah!

banananah by The Fluffeh! May 7, 2017