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1.
Salutaion.
Form of greeting and hello's
Booyakasha! Check Dis!1

(See Check Dis)
by Paully May 08, 2003
 
2.
straight from the mouth of Ali G himself, in an interview with spin.com

Could you translate your catchphrases "booyakasha" and "wagwaan"?

"Booyakasha" means "listen up rudeboi everytin irie whayaso lickylicky ya wangagot fifiman." "Wagwaan" means "booyakasha."
booyakasha: "listen up rudeboi everytin irie whayaso lickylicky ya wangagot fifiman."
by daimonn November 08, 2006
 
3.
Actually it is a Jamaican patois approximation of the sound of a gunshot- you hold two fingers in the air and shout "BOOYAKASHA, BOO- BOO- BOOYAKASHA"
Rudy tink he a badman, we have to go bust him- BOOYAKASHA!
by the Ingster July 06, 2004
 
4.
Booyakasha comes from the Irish word "buíochas" (pronounced bwee ah kuss) which mean "glory to" "or praise be" as in "buíochas le Dia" which means "thanks be to god". Oliver Cromwell sent 1000s of Irish to the plantations in Jamaica, and a lot of Irish (or Gaelic as non Irish people know it) words made it in to Jamaican patois. Another example is "Irie" from the Irish verb "Eirigh" (pronounced "Ire - ee") meaning to get up.
Booyakasha! you know it!
by Michaelkelly Kelly November 28, 2007
 
5.
A variation on the now quaint "booya!" meaning "all right!" "hell yeah!" or "sweet!"
"I took that slammin' hottie home last night, brah."
"Booya-kasha, dude."
by fallandmiss February 24, 2007
 
6.
Don't know what it means but Ali G didn't make it up. Rapper KRS-One shouts it out at the beginning of "Keep Their Heads Ringin'" by Dr. Dre. In 1995. Before Ali G. Probably Jamaican roots then...
"Friday" Soundtrack 1995 booyakasha
by brvid22 April 27, 2008
 
7.
Booyakasha is a polite way of saying booya.
It comes from hebrew בְּבַקָּשָׁה (b'vakashá) which means "please" or "you're welcome" and from booya (see booya)
Sasha Baron Cohen probably invented it for his character Ali G.
Booyakasha! Diggidy check Dis out!
by notaiga June 25, 2013