1. (insult) Somebody who would rather take a meat injection up the shitter than stand up for himself or others.
2. (insult) Somebody who loves taking cock up the back passage more than anything else on earth.
3. (insult) Generally a bit of a tit.
"Hey there goes that fucking 'cock-monkey' Johnny, Let's douse him in oil and set fire to him!
"I hate Harold, he's such a cock-monkey."