Meaning
Just like that; for no particular reason; without warning or cause. 'It happen jusso' means it happened just like that, out of nowhere, and 'mi do it jusso' means I did it casually, with no special reason behind it. A run-together of 'just so', it can express the suddenness of a thing that came from nothing, or the offhand, unbothered doing of something for no real purpose. It is the everyday way of saying a thing occurred or was done plainly, spontaneously, and without any deeper cause.
Examples
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Di light gaan out jusso.
The lights went out just like that (suddenly).
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Him get up an leave jusso.
He got up and left for no reason.
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Mi buy it jusso, no special occasion.
I bought it just because, no special occasion.
Origin
A run-together of 'just so' → 'jusso'; meaning suddenly / for no particular reason.
How it’s used
Means 'just like that / out of nowhere / for no reason'. Compare 'so-so' (only), a different word.