A perfectly thrown hand grenade in a first person shooter game. One that hits the mark with precise accuracy and inflicts maximum damage, much like Tom Brady of the New England Patriots. This is not to be confused with a Xavier Nady, which do consistent damage, but only knock enemies out of the park about 20 times a season.
Devin: Oh shit! Double kill from the other side of the map with a plasma grenade!
Sam: Yeah that was a Brady Nady right there!
Marco: Did you see my Brady Nady I just threw?
Devin: That was more of an Eli Manning Nady, but at least you're trying.