1 definition by Laura Hayward
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 Jan 25, 2011 add a video