Warface

The facial expression (mainly male) displayed when on the vinegar strokes or taking a particularly stiff constipated dump. May additionally be accompanied with beads of cold sweat.

As Bob got his warface on, he regretted eating three loaves of bread.

Show Me Your Warface

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!"