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1.
Friction caused by two or more cocks. WARNING: When being lucky men with "balls of steel", sparks may occur. Keep from heat.

May or may not be on purpose depending on swingage of involved males.
Man, I was getting grindage on this chick last night and this guy pushed up in there. There was some awkward cock friction going on.
by kayloh February 14, 2009
 
2.
Cock Friction is what happens when you are fucking the same hole as another dude. Usually, it is the pussy. Cock Friction can lead to intense orgasm and extreme cases of liquid fog.
Kippers and I ended up fucking Beckies cunt at the same time. Cock Friction only made us last a couple of minutes before we both unloaded.
by Paul Kippers April 22, 2011