The moment when you've reached the peak of a yawn, total satisfaction, and you unintentionally let a noise drone out through your open mouth.
Chivrel yawngasmed obnoxiously loud at work today!
by MissBloodySunshine September 17, 2009
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A yawn that sounds similiar to a female orgasm.

Yawngasms often occur among young women during class in which the boisterous yawngasm breaks the studious silence. Yawngasm are often perplexing and embarassing especially to the female who yawngasmed. After a yawngasm several young males will crack erotic jokes much to the chagrin of the young woman.
Jessie: "yawngasms"

Mark: "Who Jessie! I didn't know you were wet!"

David: "That's how she sounded last night!"

Chris: "Lay off the clittrigger Jessie!"

Jessie: "Shut up you guys! I'm tired not horny"

Mustaf: "Your nipples prove otherwise"
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Involuntary orgasm while yawning is a side effect of some people taking clomipramine.
My doctor put me on clomipramine, and I think he needs to change the dose, because yesterday evening I had a Yawngasm
by Musical Man January 2, 2019
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When you yawn so hard you nearly bust a nut
Dude. I yawned so hard I nearly dropped a yawngasm in my jocks.
by Sir_Rutto June 26, 2020
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