A seriously intoxicated person, male or female, who finds comfort and solace by lying in the bath tub at a house party. Can often be detected by the tell-tale signs of shampoo bottles, razors, luffas, lying on the floor by the tub. These items will have been knocked over by the tub drunkie as he/she climbs into their safe haven.
Partygoer #1: Has anyone seen the birthday boy?
Partygoer #2: Nope. He was pretty effed up. He probably passed out somewhere...
Partygoer #3 (coming out of the bathroom): Found him! He's lying in the shower covered in barf. Poor little tub drunkie...