WordNet sense 1 (a person who is controlled by others and is used to perform unpleasant or dishonest tasks for someone else):

creature, puppet

WordNet sense 2 (obscene terms for penis):

cock, dick, Peter, prick, shaft, pecker, putz

WordNet sense 3 (ride in a car with no particular goal and just for the pleasure of it):

joyride, tool around

WordNet sense 4 (the means whereby some act is accomplished):

instrument