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3.
When two men derive sexual pleasure by rubbing or smacking their penises against each other.
Bob told Chris not to fuck him in the ass, so he turned Bob around and went clash of the titans.
by knowlto November 17, 2004
 
1.
A threesome with two fat chicks in which the man lays in bed awaiting sex and a battle ensues between the two fat chicks to see who gets his penis first.
Bob: Hey Joe! How was that threesome last night?
Joe: It never happened Bob. The two girls battled to the death in a Clash of the Titans.
by hurricanhercules April 15, 2010
 
2.
A man hasn't come in 72 hours, he gets hand from a women/man who has a cold, as he is about to cum he uses a feather or such item like that to make the man/women sneeze and if timing is right, the big cum shot and the big sneeze should clash in the air. hence clash of the titans
Zach has a cold and is give sam hand, zach sneezes when sam cums and both the cum and mucus collide in mid air. They would then have completed clash of the titans.
by El Aido January 26, 2011
 
4.
When having sex with a female doggy style the man pulls out and has the female poop at that precise moment, the poop and cum meet in mid air having a clash of the titans
Dude I heard Adam pulled a clash of the titans with his girlfriend the other night and it took hours to clean up the after math.
by 7fingersphil May 03, 2008