Batty jaw refers to the butt cheeks, arse or buttocks of a person/animal.

Origin from botty (plural botties)

(childish, slang) for bottom.
Clap your batty jaws, them.

You need to wear a better shorts to cover up your batty jaw.
by Tropical Rythms December 10, 2021
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Refers to the cheek of your bum bum.
I fell and landed on my batty jaw. Hurt like hell.
by Jam can lover man February 11, 2021
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