Kanuch is a way of telling an individual to shut the hell up

Kanuch is another word for "shut up" but in like a chill way...

fuck you goodbye.

Shut up. Quit playin.

It means to shut someone up or to reject something, usually followed by a dab
Daquan was talking too much, so Shaniqua dabbed and told him to kanuch

"Stfu"

An awkward sneeze