the term ass jack-o-lantern is a somewhat more clever and (perhaps?) less childish way to call someone a butthead. it also implies that the person has a nasty face and is an enormous creeper (both of which are qualities possessed by a halloween jack-o-lantern)
the ass jack-o-lantern dated the girl that was way too good for him and wore a stupid hawaiian shirt.
by My Aim Is True August 18, 2008
A general insult. Normally used when some one does something that really ticks you off. Although some people use it for no aperant reason.
by Ryan "FordLord" McKay April 23, 2007