A person who drinks more than their fair share of alcohol.
I bought a pitcher of ale the other night and drank one pint. dave drank the rest of the pitcher all by him self. What an alcohog!
The greedy asshole who hides his or her booze and never shares becuase they "might not have enough".
You did you see Eva(random name) last night? She was a total Alcohog. Yeah, what a bitch.