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".
Durmach Calidrivurによって 2009年04月09日(木)

5 Words Related to Cocking Gun

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