Spec. used by troublemakers and geezers

1. adj. to be on your best behaviour (Please and Thank Yous)

2. adj. to be drinking and smoking (weed) heavily (Pints and Quarter -Ounce of weed-)
1. "Police are watchin me tonight mate, I best be on my Ps & Qs."

2. "Grab us that corner booth in the pub so we can get down to our Ps & Qs."
by McKenzie January 22, 2005
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When people used to misbehave in old time pubs they would be asked to watch there pints and quarts (like stop throwing them around) hence watch your ps and qs
errr

"its well rowdy in here"

"gentlemen please watch your ps and qs"
by dannydannydandan May 23, 2005
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in the days when public house allowed drinkers to run up a tab if the bill was getting a bit high the landlord would say to the punter to mind his Ps & Qs (pints and quarts) and the punter would know he needed to settle the bill
as above Ps & Qs
by hardish January 27, 2009
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Mind your Ps and Qs means to watch your manners, or be careful how you behave. It comes from Please and Thank you.
Your great-aunt's coming to tea and she's really fussy about behaviour - better mind your Ps and Qs.
by Ginnywhiskers November 6, 2010
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