What “Criss” means
Criss means nice, sharp, fresh or excellent. It can describe things (a criss car), how someone looks (yuh look criss) or how things are going (everyting criss).
Examples
Yuh look criss
You look really nice.
Everyting criss
Everything is cool.
Dat car criss!
That car is sharp!
How to use it
Casual and positive. Said about someone's outfit or look, it's a compliment.
Where usage varies
Said of a person, "mi criss" can also mean "I'm fine", as in "Mi criss Granny, nutten nuh do mi."
Where it comes from
Usually explained as coming from English "crisp", meaning fresh and clean.