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7.
Originates from African cultures. Boo-yaa was a soup BASE made for leftover foods.

In the 80's and 90's a mixture of free BASE cocaine, the residuals found at the bottom of the screen, and the resin from the pipe collected together- a collection of leftovers - was smoked. The smoker would then exhale and exclaim, "boo-yaa"
We knew he got a good hit when he exclaimed, "boo-yaa".
by TEQualey October 26, 2005
 
1.
n. (1) During the 80's and 90's, boo-yaa was popular urban slang for a shotgun, or the sound a shotgun makes when fired. Similar to bada-bing
(2) Due to the popularity of gang culture in urban areas, the shotgun imitation sound was embraced by urban culture and often used to the point where it came to mean other things, such as "Hell yeah!" "Right on!" "In yer face!" or simply "Yeaahh!"
(3)In the late 90's and early 00's, boo-yaa was embraced by mainstream white culture, and the shotgun meaning was completely dropped and forgotten. In the mainstream white culture, boo-yaa simply became a yell of exuberance or joy.
(4) The Boo-Yaa T.R.I.B.E are an experimental Los Angeles gangsta/alternative rap group. They named themselves after the urban slang word for a shotgun or the sound a shotgun makes when fired.
(1) The cat pulled out his gat, and boo-yaa! the other nigga was dead. Then he dropped his boo-yaa and ran like fuck.
(2)Boo-yaa, sucka, you got knocked straight out!
(3)Boo-yaa! Yaaay!! I won the game!
(4)The Boo-Yaa T.R.I.B.E are one sick rap group.
by Jam Master J October 25, 2005
 
2.
1. slang for a shotgun being discharged

2. Short name For Rappers "Boo-Yaa Tribe"
Damn I heard Boo-Yaa
by ac February 20, 2004
 
3.
The sound of a shotgun explosion. The word originated in 80's gang culture but first appeared in popular media when the LA rap group Boo-Yaa T.R.I.B.E. issued their debut single “Coming Hard to America” in 1988 followed by their first album New Funky Nation in 1990. However, the term didn’t begin to receive universal popularity until fellow LA rappers Cypress Hill released their debut album Cypress Hill in 1991, which used the term “Boo-yaa” liberally and sold more than two million copies on its way to becoming one of hip-hop’s classic albums. Later, the term would become known as a general shout of exuberance.
Lettin' out a bullet, this is going boo-yaa,
you're stuck in my hood, so what ya gonna do now?
-Cypress Hill, "Hand on the Pump" (1991)

Boo-yaa! That stock is a definite buy!
Jim Cramer, Host of "Mad Money" on CNBC (2006)
by Rubber Gloves January 31, 2006
 
4.
A fast powerful victory, extreme success.
A fast knock out in a fight "BOOYAA".
by Pitman July 12, 2006
 
5.
An Enourmous Douchebag on XBC
Wow, I can't believe I just schooled that booyaa!!!
by D0NKEY June 18, 2006
 
6.
Most likely from the spanish word "bulla" (pronounced boo-ya) meaning "racket" (in the sense of a lot of noise).

Earliest documented use of the word thus far: Used by the Latino hip-hop group Cypress Hill on the album Cypress Hill, which was released on August 13, 1991.

Originally used in the same way as "BANG! GOTCHA!", the definition has expanded with popularity and is most commonly used as an exclamation of triumph, in the same way as "Gotcha," or "So there!" or "Hah!".
Partial Lyric from "Hole in the Head" by Cypress Hill

Madman gonna get cha, quick with the cuente
See a gang, no there ain't no jugete
Rollin like a pyscho with the windows rolled down
Who you lookin at, you tryin to fade me clown?
Plato, si mon, you want static
When you reach for your gat to load your automatic
(Boo-yaa!!) Spittin out buckshots
Homey say blood claat, so you can call a pig
Cause no one could handle, I wind up, and loco
Insane in the brain, you get the bullet and
by MsZola June 24, 2006