Laughing Orgasm 

The Strange Phenomena Of Breaking Into Laughter During Orgasm, Often Without Explanation. Can Occur During Masturbation Or Sexual Intercourse.

"I Was Beating Off Last Night And I Ended Up Having A Laughing Orgasm."

Laughing Orgasm by Collin Jones October 10, 2005

Laughing Orgasm 

When you end up laughing so hysterically that it is impossible to speak - or even to stop laughing. It hurts so much, yet it's infectious. Often results in stomach and head aches - Oh, and tears.

'I was laughing so much I had a laughing orgasm, and I thought I was going to die, I couldn't breathe!'
or...
'He's having a laughing orgasm, look, he's actually crying!'

Laughing Orgasm by Nat Clegg February 26, 2005