Its when you are fucking a chick doggy style and you pull out your dick right before you are going to cum, place it on the top of her ass crack, then run a line of gunk from the top of her ass to her clit just like a caulking gun. This of course would also apply to the upper lip, forehead, ear-to-ear across the eyes, ect.
"I just laid a smooth line of baby batter on my girls ass crack with my cocking gun".

or

"That girls ass was so big I had to reload my cocking gun to finish the job".
by Durmach Calidrivur April 10, 2009
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A gun fixed underneath a desk preferbly located in prisons and correctional insistutions....ready to blast the cock off any man trying to mouth off
In Death Race, there was a 'cock-gun' which can be located in the prison wardens office.

Jason Statham was close to getting his cock blown off by a cock-gun
by Red_Scorpi0n August 8, 2010
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The overly messy explosion of semen, cum, sperm, man-juice, etc. all over the face of a woman giving a guy head. To be a proper cock-gun blast, the juice must get in the hair, eyes, nose, mouth, and pretty much everywhere else on the face and other areas.
My ex-girlfriend was takin a lick on my gigglestick one last time and she told me to tell her when I was about to let loose. I timed it just right so that she got a full-on cock-gun blast right to the face.
by Eddie March 19, 2005
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The overly messy explosion of semen, sperm, man juice, etc. all over the face of a woman who has just given a guy head. A cock-gun blast generally gets in the hair, eyes, nose, mouth, and just about anywhere you can think of.
Some whore was lickin my giggle stick and she told me to tell her when. I timed it just right that she pulled away and got a full-on cock-gun blast.
by Otis March 11, 2005
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N. When you wake up during the night and your friend is fucking your girlfriend with a tuba and some sour cream.
Wow, last night I awoke to the sound of a tuba and the smell of sour cream, leaned over and saw my girlfriend had both of those in her vagina. My friend Toby just gave my girlfriend the Smoking Cock Gun of Misery and Despair!!!!!
by Twelve Bananas Yes...No May 26, 2009
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