DON'T: get with no young bitch and hit it
She PG-13, you rated R, she not permitted
DO: check for ID, whenever chillin V.I.P
With fly shorty P.Y.T

from Nas – Dr. Knockboot Lyrics on Rap Genius

Meaning

Don’t have sex with bitches that are too young. Similar to how young people can’t get “in” to R rated movies, neither should young girls try to have you “in” them. To prevent this from happening, check ID’s when you’re at the club with any “P.Y.T” = Pretty Young Thing

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