The one guy that is always in the hot tub by himself, observing other peoples conversations. The hot tub guy will always be the first person in the hot tub, and the last one out of the hot tub. The hot tub guy usually makes others feel awkward since they cannot converse normally with him there. Usually characterized by massive amounts of body hair and a beer belly.
-Yeah man Amanda was really getting creeped out by the hot tub guy lastnight, he was so akward.
-Dude I know, Chris is such a hot tub guy.