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A term used to describe the contorted facial expression Matthew Fox's character, "Jack Shephard", makes when he is angry, yelling, or just plain acting crazy on the television show "Lost"
"Did you see that awesome Jackface Jack made when he was shooting at 'The Others' last night on Lost?"
by Bob the Rook May 26, 2006
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1. A good insult for someone when you're bored of the standard insults and you want to try something new.

2. A term used to describe someone who is being a jackface.
"That guy Don is a real jackface."
by Captain Ed August 06, 2004
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A moron, a dumbass, someone who is oblivious to the fact that there mere presence makes others want to vomit.

A sly way to insult someone without them knowing it.

Someone who thinks they are cool but just ends up making a fool of themselves.
"Bubba is such a JackFace!"

"What's up Jackface!"

"Look at that guy trying to pick up my grandma, what a JackFace!"
by Chris Alcott January 11, 2005
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This is a polite way to between SmartASS and JackAss to be used in public area where you need to watch your language
Stop being a jackface
by No_Mercy July 18, 2018
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