Meaning
A casual, energetic greeting between friends — like 'yo!', 'hey!', or 'what's up!'. Used to hail a person, catch their attention, or show easy camaraderie, especially among young men, 'yush' is a lively, offhand salute, often doubled as 'yush yush' for extra warmth and swagger. It belongs to the newer, street-and-diaspora layer of Jamaican greeting alongside 'wagwan' and 'yow', and it carries a bright, matey energy, the quick call of one bredren hailing another in passing.
Examples
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Yush! Mi bredda, long time.
Yo! My brother, long time.
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Yush yush, wah a gwaan?
Hey hey, what's going on?
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Him shout 'yush!' from cross di road.
He shouted 'yo!' from across the road.
Origin
An expressive greeting/hailing call of dancehall-era street culture; of imitative origin.
How it’s used
A friendly hail among peers; energetic and informal. Compare 'yow'.