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
Top Definition
noun/adjective: random ass bitch
Did you see those rabs at the party, who the hell where they?
by Maria Tiziana Stuparitz January 07, 2008
Random Ass Boner.
Matt was on the cherry picker and Nick smacked him in the RAB.
by Nick Rinke January 27, 2009
Rabs is a word created by D.Holmes in the summer of 2005 while smoking. It clearly means, Roll Another Blunt Son
Rabs- Roll Another Blunt Son
Sabs- Smoke Another Blunt Son

Dabs- Drink Another Beer Son > Created Spring 2006
by D.Holmes March 30, 2006
Acting in a regretful manner, or to be full of regret following an action.

Comes from the phrase, 'rab-regret'.
Look at that feeble man doing the walk of shame. Bet he's rab-regretting that.
by Vikram Ramsey December 22, 2010
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.
I personally think that r.a.b stands for two people, with 'a' standing for 'and'
by Honjo Norgen September 19, 2005
Rab is short for "rude-ass bitch." A less-gendered definition can be "rude ass bobo."
Stanley, stop being such a rab!

Nobody likes a rabby patty.

Yep, that's me--rabalicious!
by rabbarabba April 02, 2013
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