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1.
It's when a guy is deciding whether or not he should fuck a questionable-looking girl...first, he jacks off, and after he cums, if he still wants to fuck the girl, he should--the loss of the horniness and clouded judgment immediately after orgasm is the "moment of clarity".
I thought I wanted to hook up with my ex last night, but I jerked off and the moment of clarity told me I shouldn't.
by SpeedsterZ28 December 05, 2007
 
2.
The moment when a person realises (realistically) how breathtakingly/completely drunk he/she really is.

Usually occurs when out partying/clubbing, and most commonly when using the toilet, as the environment is mostly devoid of any stimulation and allows the person in question to self-reflect and fully comprehend how drunk they really are. May also happen when sitting alone for a period of time.

Note for guys: a moment of clarity may be unlikely if using a urinal/trough due to fight or flight response which may distract you from any quiet self-reflection.

This "moment of clarity" is usually accompanied by other strange thoughts including: admiration of the design of the toilet, wall paper, graffiti. Also looking at yourself in the mirror and realizing u look like drunk but you don't care because the feeling of accomplishment for being so drunk and knowing it overrides that.
Two guys in adjacent cubicles in the toilet:

Guy 1: "Hey dude its been a pretty fun night hey?"
Guy 2: "Holy shit man, I'm having a moment of clarity?"
Guy 1: "Haha yeah you did look pretty pissed on the dance floor the way you groped that chick!"
Guy 2: "Haha awesome! This is the best night ever!! I love you man!"
by paul2227 October 20, 2009