'Grah Grah Boom' is a sound made by only the hardest drill rappers and crazies on the streets.

It is an onomatopoeia for loud, hard hitting gunshots, particularly from a large caliber firearm that can decapitate the average gangbanger with a single bullet. It is frequently used as an adlib in various rap videos.

It can also be used to threaten someone, especially other rival gang members (Mostly in the Bronx or Chicago) with a gun, or to diss dead gang members.
"Ayy nigga we finna pull up and Grah Grah boom on dey bitch ass " - Wannabe gangster
by Lil hoodlum June 20, 2022
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Expression of frustration used by Amy Chi. Amalgamation of GRRRR and AHHH.
"Assman is so gay! GRAAAAH"
by srbradbury March 18, 2005
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Grah Blah Blah Blah is an exclamation originating in the 757 area of southeast Virginia, or Norfolk, more specifically. The origin comes from the the noise made by a large group of unnamed fly ass thugs in Norfolk, emulating the noise of vomiting.
by roflstomp May 15, 2007
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