Meaning
Literally 'go on so' or 'goes on so', used to affirm that something is correct, is how a thing is done, or is proceeding rightly. It works as agreement ('yes, gwaan so'), as encouragement to keep on the right course, or as an acknowledgement that a situation is behaving just as expected. So the phrase confirms and endorses, marking that all is going as it should and that the person is on the right track, and it belongs to the everyday back-and-forth of approval and assent in ordinary talk.
Examples
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Yeah man, di ting gwaan so.
Yes man, that's exactly how it goes.
Used as confirmation that someone has understood a process correctly.
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Keep push di work, gwaan so!
Keep pushing the work, that's the way!
Here it functions as encouragement, like 'keep it up.'
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How di party did stay? Gwaan so, everybody enjoy demself.
How was the party? It went well, everyone enjoyed themselves.
Answering a question, 'gwaan so' reports that things went smoothly.
Origin
From English 'go on so,' with 'gwaan' being the Patois reflex of 'going on/go on.' 'So' carries the sense of 'in this manner.'
How it’s used
Everyday and versatile; the exact meaning leans heavily on tone and context, ranging from calm agreement to hype. Not vulgar and fine in most settings.