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1.
Something you say when someone is saying something gay, somewhat like 'That's what she said'.
Will: And then I looked at the big Ice Cream, and sucked it.

Me: Ha Gay.
by TheGayOne January 24, 2014
 
2.
This phrase is taken off a film, where a teacher says the most important thing is respect, then a guy in the back of the class yells: "Ha! GAYYY!"
A guy: "I closed my eyes and licked the ice cream..."
You: "Ha Gay!"
by JamesMANxD February 15, 2014