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22.
This happens during a threesome (2m&1F).
If one guy is up the ass and the other is up her flange. Both guys can feel there cocks knocking against each other.
This also can apply if the 'double A/double V' method is being used!

Jane could feel them both inside her, they were a couple of cock knockers.
by Minges and all! April 15, 2003
 
23.
Used frequently as an insult, Cock Knocker refers to a person of either sex who grabs or pats a mans crotch. The act of Cock Knocking has two meanings: 1) A way for one male to congratulate another male similar to American football players patting each other on the rear. or 2) A sexual advance toward a male by a person of the either sex.
You are such a cock knocker.
by JediAndi April 04, 2003
 
24.
a guy who likes to play with his dick
Jill likes to play with her cock knocker
by Danielle March 10, 2003
 
25.
A homosexual who engages in very aggresive sexual contact, consensual or not!
Holy tits tom, you won't believe it! Jebediah just got viciously hand raped in the park by that serial cock knocker. Is he alright? No, he got ass fucked aswell.
 
26.
Any non-penetration act in which the male penis (as opposed to those weird female penises i saw on TV... yuk!) comes into contact with a hand. Most likely but no tlimited to:

-Someone who makes frequent attacks to the cock

-Someone who fondles the cock

-Someone who loves the cock

-Someone who jacks off the cock (not their own)
Being a cockknocker is not a good thing.
by Gumba Gumba February 27, 2004
 
27.
like ringing the door bell but your balls do the ringing and your cock does the knockin'
he grabbed his cock knocker till his balls rang"ding dong"
by pchmaint January 05, 2006
 
28.
When a chick grabs your dick and plays click clacks with your balls
my girlfriend is a cock knocker, when she was blowing me, she pulled my hard cock and my balls clanked together...
by cocker knocker December 01, 2003