A set of rules or a collection of norms which are unknown to the general public, but are extremely important to insiders. In many cases, the outsider learns the stripper rules as he or she is being ejected, beaten up, or otherwise aggressively educated.
Why'd you get thrown out?
Apparently putting money in her underwear was fine, but there is some rule against putting my whole hand in there...
Stripper rules. Who knew?