lard beer 

beer containing un-identifiable floaties, often whiteish and foamy looking but slightly resembling lard. Often found in warm beer that has been sitting out over night- still drinkable but slightly disgusting.

Becki: Shit, I lost my beer, which one is mine?!
Alli: Here Becks, I think this is yours....
Becki: Ew!!! It's lard beer now, I'm getting a new one.

or.... "Finish your beer or throw it away, we don't want any lard beer around here"

lard beer by SparklwingDiamond2 December 10, 2010