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To perform homosexual actions while you're sleeping and therefore unaware of what you're doing.

The excuse you use when you've been caught doing something gay but don't want to admit that you're gay.
"I think I may have been sleepgaying last night cause when I woke up my mouth was full of cum, YES I SWALLOWED IT I DONT WANNA DISAPPOINT MY SLEEPGAYING SELF"

"Dude, I swear I have no idea why there's gay porn on my phone! I must've been sleepgaying!!"
by Sinfulsilence January 20, 2017
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