Definitions by d c a

co 

Short for "coo," which is short for "cool." It is used as a positive acknowledgment or a signal of approval, not as an adjective.

Proper use:
"Hey, we're going to meet up with Jimmy at six."
"co"

Improper use:
"Get the fuck off my sister"
"Yo man, be co"

co by d c a January 28, 2008