P's and Q's 

This axiom, regardless of its origins, has been common in post-victorian Britain as an abbreviation of 'to mind your manners' or, more specifically, to say both 'please' (p's) and 'thankyou' (thank-Q).
Thus the phrase 'watch your p's and q's' has been in use to encourage people to speak politely, especially children, who remember such phrases better than just instructions.

Kid 1: You spill my pint?
Kid 2: feck off!
Mum: Oi, watch you're p's and q's!
Kid 2: Sorry. Feck off, please.

P's and Q's by Phil Bool April 19, 2006

P's and Q's 

p's = paper as in money

q's = measurement of drugs

"on my p's and q's"

song by kano

P's and Q's by g-unit-gal June 11, 2006

P.S.S. 

Pre Shower Shit

Dave: Im gunna go take a shower

Joe: Dude you better not stink up the house with your P.S.S.

P.S.S. by You know that one guy March 23, 2009

p.s.n. 

Stands for Pussy Spreading Nails.

Mostly found in the cosmetics section of your local Wal Mart. These nails have the faux french manicure.

Oh snap, that bitch has got some p.s.n.'s to die for!

Yeah, those cajun shrimp colored nails ain't jokin'.

p.s.n. by Allison January 4, 2005

P's and Q's 

Shaortening for "Pints and Quarts", which were the two main measurements for drinks. Whereas now we use pints, half pints, shots etc, there used to be Pints and Quarts.

Whehn things got rowdy, as they tend to do in pubs, you'd normally hear something like "Mind your Pints and Quarts" and a warning or some such. this was shortened to "mind your P's and Q's"

"Mind your P's and Q's"

P's and Q's by MrJR December 28, 2005

P's and Q's 

(Term of phrase used by some and understood by few...)

P's = Priorities
Q's = Qualities

"Mind your P's and Q's."

In lamens terms: Always remember that you have "priorities" in life, and the "qualities" of your character will help you achieve them...

P's and Q's by Skaughty Dawg February 1, 2007

P.S.A. 

Penis Sucking Association

Penis Sucking Association( P.S.A.) has now opened it's door for more gay members. I (slicer)along with my bf Patton lead this gay group.

P.S.A. by Slicer PSA June 30, 2012