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1.
A trap set with the intent of getting a heterosexual to admit obscure knowledge that a homosexual would/should definitely know.
Trapper: "You're as annoying as that right-winged nut who is a host on The View"
Trappee: Elizabeth Hasslebeck?
Trapper: GAY TRAP!

Trapper: "I could really go for one a drink with Peach schnapps in it"
Trappee: How about a Sex on the Beach?
Trapper: GAY TRAP!
by mayormccheez March 27, 2010
 
2.
getting a dude to use a gay word in a sentence
hay frank what color is that dudes shirt, its not red or pink, frank answers its fuschia, resopnse GAY TRAP
by Shaft out March 13, 2010
 
3.
Yelled out when someone says or does something that could be considered gay. This can be set up to catch someone out.
Girl: Does anyone know when Justin Bieber's birthday is?
Guy: 1st of march
Other Guy: Gay Trap!!
by SAIRS December 02, 2010