The time after a late-bloomer has finally come out (after they have already gone through biological puberty) and is hyped up, excited and emotional about being gay, since they finally get to pursue who they now realize they really want to, and so act hormonal, like they are in puberty again.
Sheen: "Sam you are getting on my nerves with all your guy stuff and troubles"
Sam: "Hey, don't hate, I'm just going through gay puberty"

Mary: "I really fancy Jill, but she acts like such a teenager most of the time... What's up with that?"
Jane: "Well.. She's only recently come out, she's still going through gay puberty"
by ruggerlad August 28, 2011
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