P's and Q's

Back when printers were like ancient monkeys typing on a typewriter, they had to set up each letter. P's and Q's looked like each other flipped. So telling someone to watch their P's and Q's is like telling them not to be a clumsy idiot.

It's like telling a kid to say please and thank you. But with more swearing and less grace. P's = please. Q's = thank you. So watch your P's and Q's or you're a rude little brat.

P's = paper money. Q's = drugs. So when someone tells you to watch your P's and Q's, they're warning you not to get caught with both paper and drugs.

Short for Pints and Quarts. Used in pubs when the drunk people start fighting. So watch your P's and Q's or you'll end up in a bar fight.

P's = Priorities. Q's = Qualities. So when someone tells you to watch your P's and Q's, they mean don't forget what's important and what makes you good.

In GTA V, a packet of M n' Ms. Probably means something stupid. Like a kid's snack or something. But it's still cool.

Peace 'n' Quiet. A phrase used by people who want to be left alone. So if someone tells you to watch your P's and Q's, they just want you to be quiet and not bother them.