rb 

a dirty abo who is the fattest man alive.

omfg rb your the fattest man alive LoLz

rb by smuabo May 14, 2003

RB 

The Right Bastard, God, The Lord.

May The RB bless you.

RB by Francisco Sp December 9, 2007

rb 

random bitch

ilian brought home a skanky rb the other night.

rb by beastofthemiddleeast October 4, 2008

rb 

racist bitch
someone who makes racist AND bitchy remarks

Ugh! What an rb! Is he even allowed to say that?

rb by theoriginalRB January 20, 2016

rb 

rb stands for rant buddy which technically means you rant to them about something, or they rant to you, or you two rant to each other about how complicated your lives are.

man I could really use a rb right now I can’t deal with my problems anymore.

rb by Gabbie June 15, 2018

RB 

person, has big pp, big dodo.

Robert: Hey RB!

RB: big pp big dodo ah

RB by bigelii September 28, 2020

rb 

They were lying. It means random boner.

“When I was at my family dinner i got an rb”
“Was your aunt Becky there?”
“Yeah.”
“Then it wasn’t random.”

rb by anonymous January 15, 2021