p(-_-)q
It comes from old printers who had to work so hard they probably wanted to quit. It means you need to watch your letters or you’ll mess everything up.
My teacher told me to watch my p’s and q’s because I wrote ‘q’ instead of ‘p’ on my test.
My mom yelled at me to watch my p’s and q’s because I messed up my homework.
My brother got in trouble at work because he didn’t watch his p’s and q’s.