Someone whos is always pissed off at everyone. The smallest little things will upset a Mad Cap. A Mad Cap rarely lashes out since, anger is not bottled up it is just a constant flow of hostility.
My good friend Tony Reddick is a Map Cap(per).

Would you look at that guy! He is such a Mad Cap. He is the Maddest Capper I know!
by Phoenixsky7775 January 12, 2012
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"Psylocibe Extract". A non-lethal capsule of dehydrated and processed Psylocibin from the Psilocybe semilanceata; Produces euphoria and impairs the thought process; Found most commonly in South Africa, England, and the Americas'; Paranoia, confusion, and fluxuations in emotions are commonly found; Some cases, mainly in stronger doses, may lead to minor insanity; 5g Dried Psilocybe Semilanceata is equivalent to 5mg of "Mad Caps".
"Psylocibe Extract, commonly referred to as 'Mad Caps', is a concentrated form of Psilocybe Semilanceata. Over 20,000 adolescents reported to have tried 'caps'on a study done in June of 2002 in schools in England. Also commonly used in smaller doses to stun.
by http://www.shroomery.org September 9, 2006
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A mushroom cultivated by Night Goblins, which, when brewed into a beer, is one of the most intoxicating subtances not known to man. The beer is often force-fed to unfortunate gobbos 3-4 hours before a battle. He is then given a huge ball on the end of a chain. His mates than hold on VERY tightly to him (sitting on the gobbo when required. They know that if he starts swinging that ball ANYWHERE near them, they're going to meet Gork (and possibly Mork). When the unfortunate enemy aproaches, he is given a push in their general direction, and the best is hoped for.
by Warhammer Nerd March 24, 2004
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When you're writing someone and they made you mad so you write all or part of the message in caps.
My husband texted me that he crashed the car again. I was so mad I wrote back in all caps. I was ALL CAPS Mad.
by Billy Mumphrey's Downfall October 30, 2015
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A piss poor excuse for a human. A waste of human flesh who thinks there gods gift to the world.
The asshole the mad cap hates Juggalos because he's not one and can never be one because he has his dick shoved up his ass.
by Me and only me. October 9, 2017
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