Fight Water

An alcoholic beverage that is created when all other mixers have been expended. Fight water occurs near the end of the night in order to hydrate and keep drinking.

Fight can refer to the battle between the alcohol and the water, or the effect of proper hydration and inebriation which puts the drinker in prime fighting condition.

Vodka + water = fight

Watch out, Sam's drinking fight water now.
Oh shit, someone's about to get fucked up.