This word refers to a person that is easy to knock out during a fight.
"He's got a glass chin that lad. I saw him take one punch from a 4ft midget and he went down straight away!"
de TheCoroner 9 septembre 2005
Someone who has a weak chin or can't take a punch.
"How's it going?" "Mmmbad" "Did I remind you that you have a glass chin?"
de Pat Rorke 2 septembre 2008