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An orgasm so intense, it triggers seizure-like movements such as rapid shaking or trembling, often followed by passing out and becoming unresponsive for a few minutes.orgasm
Me: Wow! That was incredible. I haven't cum like that in quite a while.

Her: Yeah, you had a real seizuregasm there. I was gonna call 911 because you were shaking so much and passed the fuck out for 6 whole minutes! What's your name again?
by madpilot66 April 01, 2011
What happens when something is amazingly wonderful that it makes you orgasm, but is so out there and random that it gives you a violent seizure.
Dude, that just gave me a seizuregasm.
by LeafeLillith April 18, 2009