General slang term, normally acceptable for PG-13 audiences. Used in mixed company over other preferred terms like: ass hat, cock knocker or bitch weasel. Synonymous with douchebag or doucher.
Steve: Dude, I just waited in line for 8 days like a hobo at the soup kitchen just so I could get this new iPad 8!
Not Steve: Dude, you're such a pubic fruit.
Dude 1: Man, why'd you drag me along to your cousins graduation, it's all jail bait here.
Dude 2: You're captain of the Pubic Fruit Brigade.