A "know it all" that actually knows very little. Talks a lot but says very little of value. Every word out of his or her jaw is most often best ignored, especially if you can't sort through the crap.
He gives a wonderful first impression but once you get to know him you'll realize what a real fuck jaw he is.
by Clancey Lufkin May 4, 2006
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Fuck-Jaw is when you have used your mouth so many times to perform oral sex that your mouth is so tired it can no longer open to even eat. Much like Lock Jaw!

When your jaw AKA mouth can no longer open because of too much sexual acvitity.

When a mouth is fucked so many times by a big cock that it can no longer stay open for further pounding.
"Dude!""Bobby pounded that bitches mouth until she got Fuck-Jaw!"

"Apparently Debbie died of Fuck-Jaw!"

"Once again I was on another date with some bitch called Susan... the ho' couldnt take my big cock, and the dumb bitch got Fuck-Jaw after 2 hours of jackhammering her mouth!" "So anyhow I just bent her over and fucked her in the ass!"

"I heard Glenn came down with Fuck-Jaw in Miss Anderson's Drama class...Hrmm I guess hetro status may no longer be guarenteed!"
by MilkyMoon777@Hotmail.com September 1, 2006
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when you are face fucking a person and you aim your weiner towards the jaw so that everytime you fuck their jaw opens and closes
did you here about steve o i heard he was mad at his girlfriend so he jaw fucked her so hard he broke her jaw and she died wow that nick kid is a fucking tool
by jobdsaekfkdsjjjjfjjjfjjf July 28, 2008
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