Any California male who smokes weed and eats fast food, which normally ends up on a clean shirt. The person then becomes The Dirty Shirt, and will deny he is dirty regardless of how much crap he has on himself. To prove his point he will continue to wear the soiled shirt for days on end.

A white female that has sexual relations with a black male.

a gay guy

girls who show up for no reason without warning and get in the way of macho time.

Usually a plummer who doesnt own a clean shirt. Also a plummer who shits behind a dumpster and wipes with his shirt.

Nothing will keep me from vacation. Dirty shirts are going to happen. So is my going on vacation.