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1 definition by J-zKo*

 
1.
1.A jaw that is easily broken by a punch to the face or chin.
2.A person with a glass jaw can't take many punches and loses a fight very quickly, usually by being knocked out.

"You shouldn't throw stones if you live in a glass house and if you got a glass jaw you should watch your mouth, because ill break your face." - 50 Cent

by J-zKo* April 08, 2009