Pronounced, Ian B, its an acronym for "I Ain't No Bitch." It gives extreme amounts of confidence when in a tight situation. It is shouted to help someone overcome fear or confusion. When you are stuck in a situation where something is hard to decided, such as, "Should I run the yellow light?" Say to yourself, "IANB!" and everything shall clear up.
by Keoni Nelson February 7, 2008