A discreet abbreviation for the term pussy monster (a person who is good at giving a female head, as described in the lil wayne song "Pussy Monster," used mainly to discuss your sex life in the company of others i.e. co-workers or professors.
"Oh girl my mantorn my clit up last night. He's a PM for real"
A word used to describe an extremely scummy person or object. PM is mostly synonymous with siclid. Can be used as a verb. When someone does something extremely scummy, it's called "pulling a PM." PM is always hurtful. In order to be called a PM you have to be one of the scummiest people ever. In order to qualify as a PM, you must have already qualified as a siclid.
An attractive person. i.e. someone you'd go home with before you get too sauced to care. The other end of the scale is a 4 AM, which is reserved for the last-chance stragglers.
"You gonna rock that beauty?"
"I'm buying her snacks, Broseph--that one's a PM"