Doing a Cooper is to act sick or injured to get out of something you don't want to do. Helpful for dodging work, school, sporting events and visiting Grandma.
Cooper is one of the worst friends you can have, he will always turn his back on you and treat you like shit. He also rapes girls whenever he gets the chance to, never trust Cooper because he will always fuck you over.
"Did you hear about what Cooper did with the fire?"
"Yeah, he is dumb as fuck!"