by ghostrideit January 26, 2009
Mike: *Goes on Facebook and see's a hoe posting a picture*, comments "Lmao why you showin yo ass like that smh r.a.b"
by Hezi June 30, 2012
Since the release of Rowling's Black family tree (auctioned off), it has become more and more probable that the mysterious R.A.B. is Regulus Arcturus Black. It just fits. However, you gotta be suspicious of this, because Rowling never makes anything so obvious... but who else could it be? I suppose I'll believe this theory, but something tells me we're probably in for a surprise.
... R.A.B. is probably Regulus Arcturus Black, Sirius' younger brother, who was killed at the age of 18, presumably by Voldemort himself.
by Onymous... April 06, 2006
Since the release of the last Harry Potter book, we know that R.A.B. stands for Regulus Arcturus Black, brother of Sirius Black. R.A.B. removed one of Voldemort's Horcruxes from its hiding place.
by DefinitionMaker September 16, 2007
The person who took the real horcrux in Harry Potter and the Half-Blood Prince, the sixth in the series of seven books. As of now we do not kow who r.a.b is for sure, but fan speculation is running wild that it is Regulus Alphard Black, Serius Blacks' younger brother who used to serve Voldermort.
by Honjo Norgen September 19, 2005
R.A.B (pronounced "rab") stands for Rude Ass Bitch. R.A.B is someone who is known to be nasty and especially shady. It can also be used to describe someone who is just over the top feeling themselves to the point of being annoying af.
Ugh did you hear what Alizaih said about Aretha yesterday?? She's such a R.A.B!"
"Justice stop looking in the mirror you're starting to look like a R.A.B"
"Justice stop looking in the mirror you're starting to look like a R.A.B"
by Girlwhoknowsnothing November 03, 2016
R.A.B stands for "Ratchet Ass Bitch". You would probably use this one someone that you don't like. Or someone who is pissing you off.
by bxlla March 01, 2017