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1.
The act of making out
-Did you see those two making out?
-Yeah, they were totally going under the hat.
by cc911 December 22, 2008
 
2.
A gay man who does want to admit that he is gay.

Slang for gay men who have have not come out yet when referring to each other in the park at night
Hey bro, you under the hat like me?

He was under the hat until his wife found out the truth
by Tetrault March 19, 2013