When a girl looks hot from a distance, but when you see her at 20 feet or less, she turns out to be butt ugly. Usually leads to ackward moments
Friend 1: Dude that chicks hot, I'm gonna go talk to her
Friend 2: Nice
*10 seconds later*
Friend 1: Uhhhhh, 20 foot rule
Friend 2: Hahaha noob
Friend 2: Nice
*10 seconds later*
Friend 1: Uhhhhh, 20 foot rule
Friend 2: Hahaha noob
by 980069 July 26, 2006
Get the 20 foot rulemug.