Radder Than the Raddest Radish
Used to describe a person, place, thing, situation, feeling, action, or thought that is overwhelmingly cool and/or hella awesome.
John: Yo, that's a cool flute.
Flutist: I know, it's radder than the raddest radish!
Flutist: I know, it's radder than the raddest radish!