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1. rb
Random Boner
Jim tried to hide his RB by crossing his legs.
by anonymous Oct 28, 2003 add a video
2. rb
a rogue boner you receive at unexpected times

a surprise in your pants!
Dani: Josh you've got a huge rb!
Josh: Thanks for announcing it to the world! ::winks::
3. RB
Short for Rat Bastard. Something you would call someone for pulling a shaddy or lame manuever. For example, taking credit for you work at your job.
You are such an RB, I can't believe you ate my last bagel.
4. RB
myRedBook (RB) adult entertainment community
I found this hottie from RB who blew my socks off!
5. RB
roast beef short for roast beef dangles. nasty dangly female genitalia.
Broski I got that chick back to my place but she had nasty RB, I couldn't beat.
6. rb
reverse boner
Person 1: Dude ew look at that fat chick...

Person 2: Awww dude I just got an rb
7. rb
An acronym for retarted bitch.
Miranda is such as rb. She always does the stupidest shit.
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