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2.
the post-meal food drool in the corner of a person's mouth that they tastelessly leave for other's to gaze upon.
after we ate a the pizza parlor, Harry had facegravy all over his mouth and no one said anything, and we all enjoyed it.
by manfun December 04, 2011
 
1.
The act of pounding and/or bashing a person's face into a wall or the pavement until their face turns to a gravy-like substance
"Lets make FACE GRAVY!" -- Goliath, Borderlands 2
by James moore May 11, 2013