Top Definition
The act of having anal sex with another person.

Though the phrase does not necessarily have to be used in that fashion. It can be used whenever the user feels it is appropriate
Aw man i was mackin those bitches and i gots to do them all up in da butt.

or...Hey lets get some ice cream all up in da butt!
by Dylan Jones July 21, 2006
5 Words related to all up in da butt

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