Definitions by Gnomerer

Crucial 6 

Term often used between multiple partners to alert the individual of an attack from the rear usually pertaining to a zombie outbreak.

Todd: "I'm doin' so awesome, nothin' can stop us now!!"
Jack: "TODD!! Check your crucial 6!!"

Todd: " Thanks man, that zombie almost mounted me from behind!!"

Crucial 6 by Gnomerer December 21, 2010