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4.
Traditionally, the most evil of all goblins whose cap is dyed red with the blood of his human victims. In recent times, this is a term to define the fugliest of all women. She will take domain in your home and not let you hang out with your friends.
Chris: "Hey Ryan, wanna go to the bar and watch the game?"

Ryan: "I can't man, Kara wants me to sit in my bedroom and hibernate all weekend."

Chris: "Damn dude, you gotta get rid of the redcap... so juicy."
by A Dub November 08, 2006
 
1.
Red Cap, a distinctly Canadian beer, is sold in a stubby bottle and has been compared to mule piss as well as the discarge from an elephant's anus.

This product, if offered to good friends who help you move, should not be consumed and the purveyors of the Red Cap should be ridiculed for months thereafter. Also, any situation which has a negative outcome or shamelessly cheap origins can be referred to as a "Red Cap" situation.

Red Cap can be used as a verb, interchangable with "Pwned."
The Beer
Gracious Idiot: Thanks for helping me move guys. We got you some beer, it's in the fridge.

Good Friends: RED CAP? What the fuck?

Gracious Idiot: Yo man, it's good stuff.

Good Friends: Way to break a fin on us.

The Verb:
Stubs: Hey baby, you got some fine curves kickin on that ass. Can I hit that?

Fine Ass Bitch: Go Red Cap yourself, loser.
by Red Cap Rudy April 05, 2005
 
2.
British; A military police officer.
Run for it the Red Caps are outside.
by R1952 December 27, 2007
 
3.
A member of the British Royal Military Police. Probably the world's most proffesional and well respected police force.
There was severe rioting in the city last night until they sent the Redcaps in.
by muffindamule October 05, 2006
 
5.
A southeast Texas fast food restaurant chain, known for its old-timey looks and astounding food to spit ratio.
Pete: Have you been to Red Cap lately?
Stew: Yea, a bunch of Scene Kids work there who spit in your food.
by Your pseudonym February 24, 2009
 
6.
Type of psilocybin. Psychedelic hallucinogen mushroom. Usually in season (in California) around late spring/early summer.
If you want some good shrooms, red caps are in season right now.
by ShmiRave June 04, 2014