Baseball terminology. Refers to an
upper deck, opposite field home run. Combines two feats of
hitting that are hard to achieve to create an extremely rare event. Usually used for
intimidation, much like calling your home run before the at-bat.
Batter: Let's go, uppo oppo, baby!
Pitcher: Oh shit, I'm
intimidated.
(Insert name of steroid-using slugger) went 4 for 5 last night
going long twice and jacking one uppo oppo way into the
nosebleed seats.