Top definition
1. (n.) The face one makes when they exclaim, "Boom!".
2. (interj.) Exactly like exclaiming "Boom!" This works because it conjures the mental image of the face you would have made had you just said, "Boom!" (Note: typically is performed without actually making a boomface.)
"Boomface!"

"Is that really your boomface?"
by roryktheinventor July 31, 2009
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