1) Used when referring to
something which is crappy or un-useful.
2) Used just after being told
something that you really didn't
need to know.
3) Someone who is boring or making the situation boring.
1) God, this stereo is so gay!
2) Man1:
Oh man, you're
sitting in a car!
Man Sitting in Car: Dude, that is so gay.
3) God this party is so gay!