A fork of Rural Dictionary
Meaning "Tits or GTFO (Get The Fuck Out)". Usually found on sites known as 4chan, 2chan, ect
Someone posts a picture of a pretty girl and the next post states "Rule 31"
at the time 2:31:00 (A.M. or P.M. i don't believe it has been decided) all are located in Robin C.'s bed doing things of a sexual nature.
theater geek one: hey! do you know where we are at 2:31? theater geek two: ROBIN'S BED!!! RULE 2:31!!!