This Shonglish expression means to be ahead of the curve and excel remarkably as a frontrunner at what you do so much that you become second to none.
Kuchi means "to". Master here means a dominant player. Chi means this. Gemhu means "game" (although when used in slang, a game...
It's a word that you kinda put before some verb so dat you flip whatever you saying and express it in the past tense. Another closely related word to did is ehn.
I thanked them
Mi did tengk dem
I walked to their house
Mi did waak fi dem ous
I talked to them last week
Mi did taak...