Someone who has a foul or smart mouth.
This can be heard on That '70s Show by Debra Jo Rupp's character Kitty Forman.
Red: Oh, shut up, that’s it, I have had it! You know what this means? More discipline!
Kitty: No, no…
Red: Oh, yes. Play time is over.
Kitty: Oh, stop saying that! Your cracking down is not working.
Eric: Hell, I could’ve told him that a week ago.
Kitty: Now is not the time to be a Porky Mouth. Red, I want my house back.
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