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1.
a very un-p.c. way of saying "that sucks". also a much cooler and funnier way of saying it.
did you see ryan's hair when he put that gel in it? it was hella gay, yo!
de pooter-face snatch-queen 29 mai 2003
 
2.
Super happy. Uber gay. As in, a celebration of hip hop/hipster/hippy queer-straight-and-everything-in between dance event occurring in Oakland once a month.
de gofifigo 1 septembre 2009
 
3.
Originally from Oakland, California, but grew and has been labeled by both locals & outsiders as a Bay Area slang term:

HELLA
hel-la
adverb:

Extremely, Largely or Plentiful

HELLA GAY
hel-la-gay
adverb & verb:

A person performing an extremely unpopular or unfavored act.

Description of a bad, un-welcomed or uncomfortable situation.

Slang definition of a negative pun

Highly criticizing one's actions

Humorous compliment of a funny and/or unusual act
"Dude, those nut-huggers you call pants are hella gay."

"Cause you didn't lend me 5 bucks, you're mom's Hella Gay!"

"If you don't lend me World of Warcraft, then your mom's like Hella Gay!"
de jay.boy.deez.nutz, MoFo ! ! ! 28 janvier 2012
 
4.
A way for morons to say they are displeased with something. In general, these people have spiked hair with gel that has seeped to their brains.
Duuude, thinking is helllllla gay...
de Anonymous 25 août 2003