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
A band, my favorite band, that once you start listening to them, you realize its the most meaningful music out there. The frontman, Daryl Palumbo, lyrics are so full of anger and hatred for his past "loves" He has even more sadness and rage for the disease he suffers, making this band the best band ever.
glassjaw is my favorite band.
1) Jaw made of glass.

2) Extremely brilliant. Great. Erm, yes.
Me: "Glassjaw rules"
by IkeM October 20, 2003
1.sensitivity to criticism, especially of a defamatory sort (from sense 2)

2. the inability of the chin of a boxer or other martial artist to withstand direct hits
Why is it than a verifiable dictator always seems to have a glass jaw?
by The Return of Light Joker February 25, 2011
A unique punk band that plays a truly different kind of music, that could be compared to At the Drive-In. They formed in 1998, with only 2 members at the start (J.C on guitar and Julio C. Martin on drums). They wrote several songs before adding in Ariel Arro as their second guitarist, and Willy on bass, following up with Jason Calleiro on kickass vocals. Before their first tour, though, Willy dropped out and was replaced by Anthony Lopez.
They got signed to Ides of March Records, getting their attention by playing highly energetic live shows.
They released their first album in 1999, titled Miles Ahead of Where We Left Off. After a few more tours, they switched to Eulogy Recordings and, shorty after, recorded their second album, entitled 7 Years Bad Luck (My personal favorite). After a while though, they switched over to Fearless Records, and recorded their third album Everything Is Beautiful When You Don't Look Down.
"Duuude, I saw Glassjaw live last night and they were insaaaaane."
by Kappz March 04, 2012
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