Meaning
To eat up greedily and completely — and, by extension, to mess something up, ruin it, or maul it. Built on 'nyam' (to eat), 'nyam up' can mean devour everything ('dem nyam up all di food'), or figuratively spoil, botch, or chew something to pieces ('yuh nyam up di whole plan'). A vivid word for consuming or wrecking utterly.
Examples
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Di pickney dem nyam up all di cake.
The children devoured all the cake.
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Yuh nyam up di work, now wi haffi start over.
You messed up the work; now we have to start over.
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Di dog nyam up mi shoes.
The dog chewed up my shoes.
Origin
From [[nyam]] (eat, of West African origin) + 'up'; to devour, or to mess up. See [[nyam]], [[nyam-out]].
How it’s used
To devour greedily; also to mess up/ruin something. See [[nyam]], [[nyam-out]], [[mash-up]].