A word frequently used to disguise the fact that you haven't been paying attention. Often times it can get you into trouble.
"Ohmygod Erin, my boyfriend...he's been cheating on me for ages and... hey, do you remember that girl Bertha? Well she is like a whore. So anyway, he dumped me last night!"
"WHAT THE HELL? ARE YOU EVEN LISTENING? YOU'RE AN AWFUL FRIEND."