So if you run your mouth, get jaw-goned
As he explains in his next line, this a double entendre
The obvious meaning is that Joey’s boy got a shotgun, and if you talk shit, he’ll blow your jaw off. The double entendre comes from “jaw-goned” which sounds similar to jargon. Jargon is any form of talking, so if you run your mouth, you’re “jargonning”
Clever Joey! You on the come up!
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