Meaning
A request to make room by shrinking your space, literally 'make yourself small', used when squeezing onto a crowded seat, bus, or dancefloor. It's said good-naturedly and is as much a friendly ice-breaker as a practical appeal, so it sits comfortably among greeting-type openers in tight spaces.
Examples
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Small up yuhself nuh, mek mi siddung.
Shift over a little so I can sit down.
'Nuh' softens the request into a friendly plea; 'siddung' is 'sit down'.
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Di bus pack, so everybody haffi small up demself.
The bus is packed, so everyone has to make room for each other.
'Haffi' is 'have to'; 'demself' is the plural reflexive.
-
Small up yuhself pon di bench, one more a come.
Squeeze up on the bench, one more person is coming.
'Pon' is 'on'; 'a come' uses the continuous marker for imminent arrival.
Origin
From English 'small' verbed as 'small up' (a common Patois pattern of 'verb + up'), plus the reflexive 'yuhself' from 'yourself'.
How it’s used
Informal and friendly; the tone is never aggressive. Widely recognised abroad through the song lyric, but overseas users sometimes wrongly read it as 'calm down', which it does not mean.