Meaning
To shove or push out — 'shub' is the Patois 'shove'. To 'shub out' is to push something or someone out or forward, to jostle, or to shove aside; 'shub up' is to crowd/squeeze together. Physical and often a bit rough. Kin to 'chuck'.
Examples
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Dem shub out di man from di line.
They shoved the man out of the line.
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Nuh shub mi, gi mi room.
Don't shove me — give me room.
Origin
'shub' (shove) + 'out'. See [[chuck]], [[shub-up]].
How it’s used
To shove/push out or aside; 'shub up' = crowd together.