(GAL, for short) a caffeinated beverage consisting of espresso, steamed milk, and a dab of milk froth, considered "goat ass" as the coffee bean is over-extracted or stale, reminiscent of the hind quarters of a certain four-legged creature. See also McDonald's McCafe.
Damn Gina, french kissing you sure has been ruined by that goat-ass latte I guzzled this morning.
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.