Refers to the act of getting buckled before you go out. However one who gets prebuckled not only gets drunk early, but often before his buddies come over for the predrink. This results in extreme buckleling and subsequent possiblity of: Passing out, shitting ones self, sleeping withfat chicks, getting crapped on.
Morty: What the fuck, Nick is really buckled tonight eh Jack?
Jackie: Ya I found an empty bottle of vodka in his room I think he got prebuckled
Morty: Nick, did you get prebuckled?
Nick: (silence)
Morty: Okay lets fuck with him get the toilet paperI gotta crap.
Pre-mullet. The shape of the hair style lends itself to growing out to a full-blown mullet, but does not possess the rear length required to qualify for aforementioned mullet.