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1.
RBJ
(verb) Abbreviation for Relax,Breathe,Joking.

1) Playing around/joking with someone jk but when really you are being completely serious and not so sure how the other person will take it.

2) A way of taking back everything you've just said to someone that you are into, cause you've just realized that they are NOT into you. You now feel like a complete chump/chumpette chump for putting it out there and need a quick way to take it all back and still look cool.

3) A response said to something that has caused that long awkward pause.
this example is good for ALL 3 definitions:

Nicholas NP: Why don't you cum suck my throbbing achey cock and make me feel better? RBJ

Nicolette NR: Why don't you stop rbj me and I'll cum suck your cock and make you feel better. Than when youre better, you can lick my pulasting dripping wet pussy, and kiss me when you're done so that I can taste myself. RBJ
by Deana Nicolette January 27, 2008
 
2.
RBJ
Receiving a blow job while running.
Last night kellen went running with his significant other, while running she proceeded to give him a blow job, which I like to refer to as an RBJ.
by Dixon Cox September 24, 2007