Basically a four fingered ring. One of the best hand combat weapons ever invented. Used in the proper way can leave an opponent unconscious or possibly dead. They usually come in Brass, steel, Pewter, and copper.
In london they call brass knuckles Knuckle Dusters.

In Japan they call them Tekko with a slightlly different design.
by longjohn May 24, 2008
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For slang terms, see Knucks,Nucks,Knuckle Duster, Knuckle Dusters

A very strong weapon, now-a-days made with high-impact plastics, or alloys. They are second and third rate brass knuckles. A true pair of brass knuckles is made purely of brass, and is going to be very expensive. It is a crime to carry around a pair of brass knuckles, they can easily shatter bones, tear skin, maim or kill someone. So, in essence, carrying around a gun or a knife is just as bad as carrying around a pair or two of those things.

Sadly however, this weapon is becoming a trendy fad. Today's Emo or Hardcore generation is wearing this mass marketed picture of a brass knuckle on every T-Shirt, Necklace, Hoody, Pair of Pants, Ring, Shoe, etc. available, and of course, the world is just soaking this up. The market is flooded with the image, because every cool kid in 8th grade has one!

So, out of ignorance, a deadly weapon is becoming trendy. Just as bad as those stupid Che shirts that every 12 year old communist is wearing, because they just know everything about politics!
Look there at that sick bastard, he just shattered that guys jaw and arm with one punch! Those Brass Knuckles sure are great right? That's why we have one on our shirt!
by Evan. February 13, 2008
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When, while having sex with a girl, you cum onto your knuckles and or front of your fingers and then slug that bitch in the face.
by YenDollarEuro March 17, 2008
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To "brass knuckle" someone is to fist them, either vaginally or anally, whilst wearing many rings on the hand used to perform the act.

It is suprisingly common in some rather extreme underground uk bdsm clubs, many of which reside in Soho, London.

"Brass Knuckling" is a chain of people all performing a Brass Knuckle upon one another.

A double brass knuckle is referred to as "getting brassed"
1.) I went to the club the other night and some guy was getting brass knuckled in the corner.

2.) - "My vagina hurts"

- "Probably because you got brass knuckled last night."

3.) "Her vagina is very wide, I bet she could take my brass knuckle"
by TheKnuckler July 7, 2012
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Also known as Brass knuckles, knuckle dusters, knuckles (there are different types and this is a broad reference) or Brass Monkeys.

Knuckles can be made out of Metal or plastics.

Real Brass knuckles can deal an astonishing amount of damage is used correctly. They are harder to find and are very costly.

Second rate metal knuckles are the most common and are often called "paper weights" or "belt buckles" to avoid legal issues.

Plastic knuckles are the least affective but can be used to get past airport security.

Knuckles are illegal in several countries, especially the United States (carrying one in public results in an a or b felony and a large fine. That's jail time of 6 months to one year)

They are illegal because knuckles, alongside usually being made of metal, cause deep tissue damage and can brutally tear up someone's face or other area repeatedly struck.

They do so much damage because they provide very good support to your fist and in turn, your fist provides a very good punch. You could just as easily do the same damage with a handfull of pencils. The metal does tend to hurt on top of that.

Knuckles have been used for years. They have been seen in torture methods, war weapons, gangs, and sometimes self defense. Sometimes they are implemented into the handle of a knife resulting in a Trench Knife. They can also be given spikes, blades, studs or other harmful accessories.
Trench knives, paper weights, Brass Knuckles, belt buckles, brass monkeys
by Jackx429 March 23, 2014
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when you're getting a handjob and you cum streams down their knuckles.
"I told her, 'Either lick up or go wash off those Brass Knuckles, please'"
by Todd McTodd October 23, 2009
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