Meaning
To give a thrilling performance that sends the crowd into a frenzy — to 'tear up' the venue in the very best sense. When an artist 'mash up di place', they have set the dance alight and won the night, the crowd roaring, hands in the air, forwards and pull-ups called for again and again. 'Mash up' here is destruction turned to praise: the place is figuratively wrecked by sheer excitement, and to do it is the highest mark of a performer's power over an audience.
Examples
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Di artist mash up di place last night.
The artist tore the house down last night.
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One tune an him mash up di dance.
One song and he had the whole party in a frenzy.
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Wi come fi mash up di place.
We came to bring the house down.
Origin
From 'mash up' (to break or destroy, the Patois sense of smashing) applied figuratively to a performance so strong it 'wrecks' the venue with excitement.
How it’s used
Entirely positive in a performance context, though 'mash up' on its own can literally mean to ruin or wreck something.