look up any word, like bukkake:
There is no rule #4
Q: How did we get from not talking about fight club to rule number five?

A: Oh! rule #5 states that there is no rule #4. That makes sense.
by Ole Black Pee Hands February 14, 2011
Man-law for cheating on your bitch. If your other bitches be livin' in a different area code there is nothing wrong with having the good ol' in and out with both of them.
Guy 1: Hey dude I'm goin over Mynesha's house.
Guy 2: But aren't you goin out with Taquisha?
Guy 1: Dude Rule #5! Mynesha lives in Boulder, Taquisha lives in Denver.

Exapmple 2.

Dude 1: Bro I fucked Moesha all night long last night! High Five!
Dude 2: Arent you goin out with Kiandra?
Dude 1: Dude! Rule #5 Moesha's a 720, Kiandra's a 970.........retard.
by Atticus Kcliine January 31, 2009