The act of post-sexual activity, after engaging in an orgasm, and forgetting what happened before the nocturnal emission, and/ or ejaculation, occurred.
Person 1: So I was fucking my wife, right? And then we stopped, and I wanted left overs for dinner, but forgot what we had! Damn Cumnesia.

Person 2: Dude I know what you mean, bro!
by BobbyBaja December 21, 2009
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When you have really good sex and forget about whatever else is going on in your life! It's amnesia from a good ole fashioned cum
I was really having a bad day. I came home put on some "O" from Pure Romance and my husband gave me cumnesia! Now I am so relaxed.
by WnabMedic January 22, 2015
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Weed, typically the strain amnesia or amnesia haze, that hasn’t been flushed or dried properly and smokes bad
“This weed tastes like shit
It’s that cumnesia bro”
by Mr. Penis 420 69 May 29, 2021
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