Jock Manipulator means in slang: High school junior high jock, who attempts to influence an ex-jock or non-jock into becoming a jock. Usually tries to have a heavy influence on him, and relentlessly try to persuade him to change into a jock with looks,speech,sports,etc. All this is done to get the person back to their jock side. Because that person is a jock friend or something. (in Slang Dictionary, added by Finley Brady)