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3.
Being gayer than two guys kissing in a park.
Dude... I saw two guys kissing once, and this is the gayest thing I've ever seen.
by Poor boy from a poor family November 30, 2003
 
1.
1. The most happy, attractive and joyous among others
2. The most high in a gay-scale, concerning behaviours and/or appearances that make one think that someone or something is homosexual or stupid.
1. He's nice, always smiling and never gets upset, probably the gayest person I have ever met.
2. I've seen men kissing each other, I've seen guys wearing pink pants, but your heart-shaped tattoo on your buttock is the gayest thing I've ever seen, John!
by Stefano D.M. April 27, 2008
 
2.
the superlative of gay, the most stupid thing ever
"That is the gayest thing you've ever said, gay, gay, gay."
by lisagirl April 07, 2003