The mouth, usually in reference to fellatio.
Ay, girl, lemme get some o'dat jaw jiggity.
A person who stands around in grocery stores or other places talking to people and your trying to get by them, they acknowledge you behind them so they ignore you and just keep on talking. Or when your talking to somebody but they don't give you time to speak they talk over you because what they have to say is more important than what you have to say.
in a sentence: You just keep jaw flapping about whatever, I have someplace to be and have important things to do!
A term used to describe a woman who can't keep their mouth off any cock that cums her way
Dude: i started dating (insert hoes name here)
Dude2: really? Don't kiss (again, hoes name here) she has dome jaw