The art of making apple crumbler in your anal cavity.
Mark Nolle won the ontario provincial bum crumbler championship in October 2010.

James Julez: Man, that crumbler was so good man, ate the whole thing in one gulp.

Mark: Bro, that wasnt just any crumble, that was bum crumbler.

James Juelz: You sick bastard.
by Laura Hayward January 25, 2011

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