Cock Smacking 

During a blow job, the man pulls out his (big) cock and smacks the girl in the face with it

John: I got head last night!
Frank: Awesome, from who?
John: Brittay, I was cock smacking her too!

Cock Smacking by Dumby August 4, 2007

Cockstacking 

A fun game in which you have a group of men from largest to smallest sit on each others lap having their erect penis inserted into the next gentleman's rectum with the largest person being on the bottom so that he acts like the base of a tree. From there the next largest gentleman would sit on the lap of the "base" with the base's erect penis in the rectum of the next largest so that he is locked in place. This act will continue until the smallest person climbs to the top like the star on a Christmas tree.

Hey guys I have a great idea! Let's do some cockstacking and see how high we get!

Cockstacking by Surfnpuff August 27, 2011

Cocksmacking 

Cocksmacking is another word to mean gay sex.

Jerry is probably busy cocksmacking with some other guy.

Cocksmacking by iminabox July 21, 2008