A Matt his is when a person (preferably redheaded) inhales the stale, foul tasting smoke from the ash left over in a bowl of marijuana. Commonly refered to as a cashed bowl, the matt hit is a desperate attempt to get one last hit, frequently causing ash to enter your mouth if your unfortunate enough to not have a screen.

A polite term for shoving a lubricated probe into the Earth's hole to release gas.