Definitions by Billzeeabob

pit biscuit 

The hardening of the t-shirt in the armpit area caused by antiperspirant build up. Often seen by people who use Mitchum brand antiperspirants.

Jay's volleyball team was grossed out to learn he was still wearing his favourite t-shirt that had pit biscuits.

pit biscuit by Billzeeabob July 7, 2009