Meaning
Literally 'what are you saying?', but used as a warm, everyday greeting like 'what's up?' or 'how are things?' — not a demand to repeat words but an open invitation to share news and catch up. 'Wah yuh a seh?' between friends means tell me how life is going and what's new, and the usual easy reply is 'nutten much' or 'mi deh yah'. It is one of the most common friendly openers in Jamaican talk, and only a hard, challenging tone turns it into the confrontational 'what are you claiming?'
Examples
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Wah yuh a seh, mi general?
What's up, my friend?
'A' is the continuous marker before 'seh'; 'general' is an affectionate term for a close friend.
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Yow, wah yuh a seh dis mawnin?
Hey, how's it going this morning?
Casual opener between people who know each other.
-
Wah yuh a seh, everyting criss?
What's up, everything cool?
'Criss' means fine/excellent; a typical check-in follow-up.
Origin
From English 'what you are saying', restructured with the Patois continuous marker 'a' replacing 'are ... -ing'. 'Seh' from 'say'.
How it’s used
Informal greeting among peers, especially common among men and in street settings. Taking it literally as a request to repeat oneself would be a misreading. A typical reply is 'nutten nah gwaan' (nothing much).