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
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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!