Top definition
a condition when you forget when you masturbated or if you even masturbated at all
Person: I'm kind horny right now. I think I'll jack off. Wait didn't I jack off earlier today? I think I have fapnesia
by capitan fap February 20, 2014
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2
You don't have any memory of when you fapped for te last time.
"Me":I don't know when I fapped for the last time doctor.
"Doctor": I think you suffer from fapnesia
by Ballzlapper December 05, 2014
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