Meaning
An interrogative meaning 'why' or 'what makes it so', literally 'what makes'. 'Wah mek yuh never call?' is why didn't you call, and 'wah mek it so?' is why is it like that. Unlike the plain English 'why', it often carries a distinct tone of genuine puzzlement, complaint, or challenge about the cause of something, pressing for the reason behind a state of affairs. Among the most common question-words in the language, it reaches, sometimes plaintively and sometimes sharply, for the 'why' of things.
Examples
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Wah mek yuh nuh call mi back?
Why didn't you call me back?
Note the negative marker 'nuh' before the verb; no auxiliary 'did' is needed.
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Wah mek di bus late suh?
Why is the bus so late?
'Suh' at the end intensifies the complaint, like 'so much'.
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Mi cyaan understand wah mek dem gwaan suh.
I can't understand why they behave like that.
Here 'wah mek' introduces an embedded clause rather than a direct question.
Origin
A calque built from English 'what' + 'make', following a West African-influenced pattern where 'make/cause' expresses reason. Similar constructions appear across the Atlantic creoles.
How it’s used
Everyday speech across all ages. It can sound accusatory depending on tone, so pairing it with a hard tone turns a simple question into a rebuke. 'Weh mek' is a common regional pronunciation.