A fork of Rural Dictionary
A fat person with some huge ass butt or booty.
Johny: do you know cee-lo Green? Pat: you mean that fatty bum bum nigga? Johny: yes pat: I do know him
Fatty fatty bum bum is a person of extreme obesity that their belly button is in a separate time zone to their arse.
Woah, that bloke is such a fatty fatty bum bum!