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1.
mouthin off, bein cheaky or gloating over a win.
"Why do you ALWAYS taunt them and humiliate those guys?!"
"Dude, they were jawing too"
by Pro69 March 12, 2006
 
2.
When on speed or ectasy or most drugs, you usually get this unbearable urge to start chewin on the inside of your cheeks ( jaws) or your lips, this at the time feels great but the next morning you usually have jawed so much that your lips are destroyed and your jaws are sore and bleeding!
me: man, what the fuck you on
him: Speed, fuck, im jawing like mad on it
me: ha!
by chooseweed September 08, 2008