1 definition by Guy on Urban Dictionary

/b/

What you DO NOT talk about ( as mentioned in rules 1 & 2 of the internet).

Guy 1: Hey what's /b/?
Guy2: (punches guy 1 in the face) WHAT THE FUCK IS WRONG WITH YOU! YOU'RE NOT SUPPOSED TO TALKED ABOUT THAT!!!

by Guy on Urban Dictionary July 30, 2011