"I'm a horrible soulless bitch and blew this guy in the gas-station bathroom before making out with my boyfriend."
"That chick just blew me, and now she's giving her boyfriend Cockmouth!"
Traces back to late 2004 when AdamQ and Christi were making rules for Christi's Canesty (pronounced kane`stir). Derived from "cocky attitude" and "bad mouth".
-AdamQ: Ummm... FAIL!
-Christi: Are you cockmouthing me? Refer to rule number 1, please.
-"OMG, that bitch was cockmouthing me behind my back!"