when someone says something really weird. akward, or something no one cares, about, so you say cool story to be sarcastic and show that you didn't care.
"So I got buger king the other day cause my mom had a coupon for free whopper, buy one meal get one free. so I got my food and took it out to the truck. well I was driving and I wanted a drink of my coke. so I tore open one end of the straw paper and blew into that. And the paper shot off to the passenger side vent! Then I laughed and forgot about it" - Daniel