When crap and lint is entangled in butt hair and crap, hair and lint all clumped together fall on the floor while wiping.
dude, I went to take a crap and there was grundle crumbs all over the seat.
When crap and lint is entangled in butt hair.
As you wipe your butt, crap and lint is rolled into the butt hair with each wipe. Over time (especially with not showering regularly) with each wipe more and more Grundle crumbs appear.