What “Chupid” means
Chupid is the Patois pronunciation of "stupid". It describes foolish ideas, actions or people. Patois often turns an English "st" sound into "ch" before certain vowels, which is where the spelling comes from.
Examples
Dat a chupid idea.
That's a stupid idea.
Nuh chupid, man!
Don't be stupid, man!
How to use it
Mildly insulting. Fine for laughing at a silly situation among friends; calling a person chupid is rude, especially to elders.