Rule 11 

If two friends of opposite gender are bored for over an hour, they must engage in sexual experimentation

Girl: God, there's nothing to do.
Guy: How long have we just been sitting here?
Girl: Over an hour.
Guy: Rule 11

Rule 11 by Johnny Postit March 30, 2009

Rule 11 

If one believes there is likely a mutual interest between themself and another individual, that other individual is either already in some form of a relationship with another individual or will soon be.

"I thought we were clicking, but then I saw her boyfriend."

"Rule 11, eh? Good luck next time."

Rule 11 by bugmore November 22, 2013

Rule 11 

Don’t be a bitch

Guy1: let’s go cliff jumping dude

Guy2: idk man that sounds scary

Guy2: rule 11, dude

Rule 11 by @UrDadsHouse April 12, 2022

Rule 11 

There is no rule 11

There is no rule 11
See rule 9

Rule 11 by dragonson04 December 9, 2012

Rule 11 

Rule 11 applies if a word isn't defined yet in the Urban Dictionary.

Rule 11 wasn't defined yet when it was first searched for.

Rule 11 by Rule Searcher January 5, 2009

Rule 11 

If it exists there is a slutty halloween costume of it

Woman: im going to be pooh beat for halloween what are you going to be?
Woman 2: slutty pooh bear, because everything has a slutty halloween costume its rule 11 didnt you know?

Rule 11 by Tinipenguin August 30, 2015

Rule 11 

Watching Porn with your friends is gay.

Guy 1: Hey, I just got new copies of porn man. Wanna go watch it with me at my house?

Guy 2: Rule 11, man, rule 11.

Guy 1: I know.

Rule 11 by Rulemaler February 28, 2009