Posted by R. Berg on October 16, 2001
In Reply to: Watch you p's and q's posted by kevin on October 15, 2001
: : where does the expression watch your p's and q's come from and what does it mean
There are different ideas about the origin. The link below connects to a previous discussion (https://www.phrases.org.uk/bulletin_board/5/messages/794.html). The phrase means behave yourself.