The act of searching for cannabis, usually but not exclusively resin, particles that have dropped on the floor. Especially when the searcher is out of cannabis and does not have the funds for more.
That's the last of the pot, I'll have to go crumbing under my chair to see if I have dropped any bits.
1. stuffing crumbs down a male's urethra, then shooting them back out during ejaculation in order to arouse self or partner's appetite and sexual organs
2. stealing an intelligent person's idea and taking all the credit for it
1. Crumbing isn't a big turn on for me, but I know my brother likes it.
2. Sam is always crumbing me! Now everyone thinks he's more clever.
The act of searching for with one's hands, and subsequent removal by sweeping motion, small pieces of dirt, food and other minutiae from the surface of a bed, esp. preceding sexual intercourse.