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1. lockjaw
1. difficulty or pain in opening ones mouth due to a medical condition, injury, or infection

2. an upper class accent
If you keep chewing your nails like that you could get lockjaw.
2. Lockjaw
A slang term for the people and accent from New England and Northern America. Coined from the fact that many people from these states mumble and, compared to a Southern Drawl, keep their mouths relatively closed when they speak.
I knew he was from the North when I heard him talk with that lockjaw.
3. lockjaw
a slang term for cocaine
I got a whole lotta lockjaw with me, but it's too bad half already in me
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