JPB is an abbreviation for a phrase, often used while text messaging or chatting online. It stands for "Just Playing Bitch". It's often used after someone has said something and want to make sure the recipient knows they were joking.
When Bob was chatting with his girlfriend, he made a mean comment followed by "JPB!". The statement following the mean comment proved to be more offensive.
by oshiejay November 26, 2007