Meaning
The backside or buttocks. Mildly rude, it is most familiar in the sharp, dismissive expression 'kiss mi baxide' (kiss my backside), flung at someone to tell them off or send them packing. 'Baxide' is a common bit of everyday coarse speech — no worse than 'backside' in British English — used in annoyance, defiance, and scolding, and it belongs to the store of blunt Jamaican words for putting a person in their place.
Examples
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Kiss mi baxide!
Kiss my backside!
A dismissive, mildly rude retort.
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Him just a sit pon him baxide all day.
He just sits on his backside all day.
Meaning he does nothing.
Origin
The Jamaican pronunciation of English 'backside', with the same mildly vulgar force.
How it’s used
Milder than the '-claat' curses, but still not for formal settings. 'Kiss mi baxide' is its most common form.