A sporting event similar to Marco Polo played inside a pool in which one participant is "it" while the others swim away trying to avoid becoming "it". The main difference between Marco Polo and Gayman is that in Gayman the player who is "it" must reach inside the other players swimming trunks and grab the others penis in order to win. Gayman can only be played by males and is not truly Gayman if any females participate.
There are also several other varieties, styles, and "house rules" versions of Gayman including Hot Tub Gayman, Shower Gayman, and Gayman: Shore Edition. In Gayman: Shore Edition one man stands in ankle deep ocean water with his swimming trunks around his ankles while the other participants body surf in waves with their eyes closed and arms extended reaching for the other player's penis.
I enjoy playing a nice round of Gayman on those hot summer days in order to cool off and "blow" off some steam. (literally)
Kavan is the current Gayman Heavyweight Champion of the world.
Miller and Shawn are the current Gayman Tag Team Champions of the world.