When someone tells you to mind your Ps and Qs, it is a polite way of saying you might be misbehaving and should mind your manners. Ps and Qs are used to substitute the term “behavior” or “thoughts.” Is it still the same in rap?
Lil Uzi Vert used this as a title for one of his more popular singles. The meaning is just the same and he uses it as a way to refer to his behavior, mindset, and thoughts about his lady. It may also be used like:
“Manners make the person. Always be aware of your bad Ps and Qs.”
However, some urban people have used this slang to refer to both money and drugs, with p standing for paper money and q for measurement of drugs.
“Why is it that gangster films always have Ps and Qs being the major plot point?”