like ringing the door bell but your balls do the ringing and your cock does the knockin'

Someone who knocks there cock.

An offensive term suggesting a male is Gay

Cock knocker is someone who loves the cock! loves the touch,the look & the smell of a hard member. A cock knocker is similar to a knob jockey however there is no penetration! Basically this phrase is an uber insult to men,if someone calls you it you gotta be ready to retalliate with similar such insults! so i hate my mate-call him COCK KNOCKER

a cock knocker is a person with a large fist who smashes males in the balls for no apparent reason.

A member of the public who constantly wastes car sales executives time by asking fucking stupid questions and wanting to test drive every car on pitch.

any person who, if approached by a male unit, knocks the cock, in a way of personal pleasure.

introspectively: knocks the cock is to suck a penis using multiple pleasuring tools such as the saliva, and tongue. fingers optional