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 11, 2012
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Crazy insane white male who has one spicifc best friend. Badass on the outside with a sweet soft inside. Tends to love weed and drugs of all kinds. Alcohol is also of common use. Racial slurs and rude comments about fat people slip out commonly. Runs the bitches and owns all.
-Wow. That white guy just pulled a madcap.

-My parents forbid me to chill with madcap.

-That madcap is a racist mother fucker.
by Chemsters April 15, 2009
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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 09, 2006
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