“Hitting off licks” is a term derived from robbing liquor stores or “licks,” which in turn became a term for any sort of traditional robbery. “Hitting a lick” also just means making a lot of money in a short amount of time.
Originated as the meaning “robbing a liquor store”, but has been gentrified on tiktok by eboys to the point where it means stealing a bag of chips from the vending machine.