Pronounced Day-eddy but spoken fast enough to sound like deddy.
to one up, upstage, out due, or out tell a story (usually negative)
the act of performing a DavidEddy
Person 2: "Oh your dog died? My dog died once, the day after I got mono, and I had to study for all my finals, and go to school the next week to take my tests."
Person 1: "Bro you totally deddyed me!"