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Generally used to refer to a Vietnamese male with the following specific appearance characteristics; long-sleeve thermal (black/white in color), a short sleeved polo shirt over the thermal (black/white/grey in color), designer brand jeans and/or black/grey Dickies, Vans/Converse (Chuck Taylors) shoes, exposed tattoos on either one or both arms (usually 3/4 sleeve to full sleeves. Common tattoos are Koi fishes, oriental dragons, chinese calligraphy, tiger, etc...) and a NewEra fitted cap worn a specific way as to where the cap sits/tilts lower towards the front on the head (usually on/covering the eyebrows) and higher on the upper back of the head (similar to how drill sergeants/state troopers wear their campaign hats).

The word dumani is singular, referring to only one person. Dumanis is plural. The word consists of "Du ma", a very vulgar Vietnamese cuss word.
Dumanis are NOT to be confused with Vietnamese gangsters, Dumanis typically look/act "hard/gangster" in appearance but will never do anything or fight anyone by themselves. a Dumani likes to "mean mug"/stare at other Dumanis in a taunting manner. Dumanis are mostly seen in Northen California but also seen in areas with a high Vietnamese population such as Orange County, Los Angeles, Houston, etc...

Any person(s) with the similar characteristics that is any other race/ethnicity other than Vietnamese would be called a "their race" Dumani-lookalike (i.e.: Chinese Dumani-lookalike, White Dumani-lookalike, etc...)
Look at this Dumani fool right here, I think he has a staring problem...
Dumani by BaoLeee! August 5, 2011
Related Words
A person who a devoted fan of Duran Duran, a British band.
"Did you know that Susie dug one of Nick Rhodes' cigarette butts out of the trash can? She's the biggest Duranie I know!"
Duranie by Sar Star March 12, 2007
The name for the fan base of the British hotness that is Duran Duran. Duranies will do anything for the band. Duranies can be any age. Duranies range from Rabid fangirls to slight fans.
Cassey: So, did you meet that british hotness that is Duran Duran?
Caroline: HELL. YES.

Jacob: Ugh, all that traffic made me late!
Jimmy: I heard Duran Duran was in town. All the rabid Duranies caused trafic jams.
Duranie by GIMMEAWRISTBAND July 15, 2011
Durrani (Pashto: دراني‎) or Abdali (Pashto: ابدالی‎) is the name of a pakhtuns tribe.

The Durranis have been prominent leaders, as the royal family of Afghanistan is derived from this tribe, and a substantial number of Durrani Pashtuns are bureaucrats and public officials, as well as businessmen, wealthy merchants and hold high ranks in the military.

Today they are known to be highly succesful and nice entrepreneurs. They're very good looking men and women that make excellent socialists, judges, doctors, lawyers and especially spouses and beaus. They are amazing people. They ate truly the best group of people in the Pashtun, Sindhi and other era. Love them fully.
Person 1: who's that guy?

Person 2: the rich dude there? He's hot, right?

Person 1: yeah who is he?

Person 2: he's a Durrani.
Durrani by Yippee1245 December 31, 2012

dormanization 

a configuration of a device, network or schema that is overtly complicated, undocumented and understood by one person and one person only. The only way to grasp its complexity is to reverse engineer the technology.
The five Cisco routers stopped working because of the constant dormanization. If we only had kept it simple, anyone would have been able to correct the problem quicker.
dormanization by q13 September 2, 2010

darmanitan 

Literally the best Pokémon to ever exist, ever. This thing could sneeze and wipe out an entire team of 6 without so much as flinching.
Is that a Darmanitan? Oh, well, I lose the game now.
darmanitan by Darmie June 27, 2017