Nearly all the old links doesn't work anymore. I tried many on the older posts but usually you have a 404 or "This page cannot be found" or even a advertising page.
Anyway I knew (more or less) what they were talking about, what I really couldn't understand was that expression.
I wondered if it was about gums or the jaw, but it was clearly an idiomatic sentence.
Glad you helped me. If they use it in the USA, I wonder if it's a Pacific-belt slang or if it's common in UK too.
Can some Britannic frenz help? (just my curiosity, anyway)