The pity puff is the last toke of a joint. It is presented to the next person in the circle as a consolation offer. Usually it is the least tasteful part of the joint and also the hottest part to smoke. It is therefore offered as a "pity" toke, or "puff".
"There were too many people smoking on one joint, all I got was the pity puff."
by CrazyEef August 22, 2012