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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
fapnesia by capitan fap February 25, 2014
Related Words

famnesia 

Memory loss caused by the amount of time since you last visited your family. Usually follows a long holiday visit, then an extended absence.
Jane's visit home last year was a real bummer, but now that it's been awhile she is excited to visit. Guess she developed famnesia.
famnesia by JG percussion March 3, 2011
Pretending that you don't know every single detail about a Facebook Friend's life so that you (a) do not seem like a stalker or (b) have something to talk about. Also an antidote for friends that over-share on social media.
(1) I had to feign Fabnesia when I was talking to my old girl friend so she thought I wasn't checking her out on Facebook! (2) If I didn't have Fabnesia, I would have had nothing to say to him!
Fabnesia by TheGoodTwin September 26, 2015

Milk of Fagnesia 

I sucked him off, then took his load of Milk of Fagnesia down my throat.

famnesia 

The phenomenon that after eating a big meal you cannot imagine ever being hungry again.
"I know you are going to the grocery store honey, but I dont know what I want for dinner. I just ate lunch and have bad famnesia"
famnesia by Snuggs O'Dade May 22, 2008

Famnesia 

1. It is when you bump into a family member in public and they pretend that they do not know you and vice versa.

2. Or when you have completely forgetten someone is family.
FAMNESIA

1.
Fam's friend: Hey isn't that your cousin?

Fam's cousin: *waves ecstatically*
Fam: *looks cousin in to the very depths of their soul* Nope. Don't know them.

2.
Mother: We are off to visit your uncle (insert name here) in the hospital!
You: ....who the heck is that???
Famnesia by W0rdPl@y September 13, 2016