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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'
r.a.b 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"
R.A.B by Girlwhoknowsnothing November 3, 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.
"Yo. Sara has been acting like a R.A.B recently."
OR
"leave me alone, your such a R.A.B"
R.A.B by bxlla March 1, 2017
A Random-Ass-Boner. For instance, when you are just sitting down minding your own business and suddenly you get a boner.
Mark: "Dude I was in French class today and I got an R.A.B!"
Steve: "Ahhhh I HATE IT when that happens!"
R.A.B by Superdean March 5, 2009
10 extremely disturbing cartoon shows with the name: Retarded Animal Babies

These shows are mostly about sex, drugs, violence and potatoes, with one show about the alphabet, although there is still sex in it.

if i were you, i wouldnt advise watching these shows, or watching them with a parent around
Guys, i been doin this all day, and nothins happened yet.

i brought 2 straight-curious lesbians playing ping pong with their life affirming jumblies!

yo dude, r.a.b is teh gross shiznit
r.a.b by Geoff Witmer April 21, 2006
Man R.A.B.s are always coming up to me and asking me to dance.

-"wait who did you hook up with last night?"
-"I don't know just some R.A.B."
R.A.B by FBGMER November 3, 2008