A person that licks dried up sperm. Particularly when a woman orgasms and the man waits till she's dry to eat out her pussy.
"Damn! His friend is a real crumb fucker!
The car wash dude took the change out my cup in my car, wow that dude is a fucking Crumb snatcher
When you ejaculate on your partner and it dries out and becomes crystallised on their skin.
Hey, your back is covered in nut crumbs.
To perform a task that has no meaning or purpose to do
Friend 1: what are you doing?
Friend 2: balancing a clothing hanger’s tip on a nail
Friend 1: …you’re really cutting crumbs here, dude