phrase used by the coolest of cool people, to request a summary of what's happening/ what's going on. Can also be used as an introductory phrase or a conversation initiator. May be shortened to simply "diddio?" when pressed for time.
Guy 1: "Hey man, what's the diddio?"
Guy 2: " Not much"
Guy 1: " What's the diddio with that?"
Guy 2: " shittty buz"