Meaning
A fit of anger, and the disposition to anger — 'him inna him temper' means he's in a rage. Someone with a 'hot temper' or 'short temper' flares up quickly and easily; 'lose yuh temper' is to give way to anger. A person 'ketch a temper' when they suddenly fly into a rage. Central to talk of tempers running high in a quarrel.
Examples
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Nuh trouble him when him inna him temper.
Don't provoke him when he's in a rage.
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She have a hot temper, she flare up quick.
She has a hot temper; she flares up quickly.
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Him lose him temper an cuss everybody.
He lost his temper and cursed everyone.
Origin
From 'temper' (disposition/anger); a fit of anger. See [[hot-temper]], [[vexation]].
How it’s used
A fit of anger / the tendency to anger; 'inna him temper' = in a rage. See [[hot-temper]], [[vexation]].