You seem to take so much delight in antagonizing her that if she says she's fix'n to come out slapping, I think you better heed her intent.....don't worry about whether she's getting ready to....ratty, you had better just start ducking....fast!
Ruh-Roh!!
I've been found out!!
Boy (or more correctly Waiter) of country, nice (or gentle) language. Say you what, you can bite my donkey.
(I can't speak to verb noun agreement or idiomatic French equivalent of that last phrase.)
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Embrassez mon derrière, Fermier. (That's how I would have said it.)