An instance when one's rationality is lost, which results in an embarrassing comment or action that goes seemingly unrealized until later. Situations like this tend to instigate anger and can go as far as one party seeking revenge through violence.
Al: Dude I can't believe you just asked to touch that girls boobs.

John: Yeah, she really slapped me hard. Do you think that was stupid?

Al: Worse, I think you just had A Madden Moment.

John: Ninty Percent of the game is half mental.
by Ghostface Slinger January 30, 2009
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