1. The face you make when engaged in a combat situation, or any situation you find serious enough.
Quote from Full Metal Jacket

Drill Sargent: "Show me your warface!"
Private: "Sir?"
Drill Sargent: "You got a warface? AHHHHHHHH! That's a warface, now let me see your warface!"
by Super Extremely Cool Story November 9, 2010
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