Meaning
'Calm down, take it easy, relax' — a soothing plea to someone who is worked up, upset, or rushing. The 'nuh' softens the command into a gentle appeal, like 'come on, ease up', and 'cool nuh, man' is a common way to defuse tension and talk a person down from anger or agitation. It reaches for peace in a heated moment, urging the other to settle and let the trouble pass, and it belongs to the everyday language of calming a quarrel or steadying a frazzled friend.
Examples
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Cool nuh, man, everyting a go work out.
Relax, man, everything's going to work out.
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Cool nuh, no need fi vex suh.
Calm down, no need to be so angry.
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Cool nuh, wi have plenty time.
Take it easy, we have plenty of time.
Origin
From 'cool' (calm) plus the softening tag 'nuh' — a gentle appeal to calm down. Compare 'cease an sekkle'.
How it’s used
A soothing, de-escalating plea. The 'nuh' tag makes a request gentler ('cool nuh', 'come nuh').