A busted ass ugly chick. A person of the female gender that's just too fat and ugly/fugly to not be made fun of. Generally used as an insult and because the word is so obscure, one can get away with passing saying 'kluuug' without the other person becoming offended because chances are they'll have no idea what the hell you're talking about. Pronounced Kay - lug like two separate words.
'Did you see that klug at the front of the line?'
'yea man, that klug was nasty.'