Something/someone of extreme uberistic qualities. The pinnacle of excellence, and superiority. Used in descriptive techniques to award the thing in question with a certificate of brilliance, and unrivaled skill.
Barry: Oh hey Glebson, you're new privet hedge seed collection is butron!
Glebson: Thanks Barry, I inherited it from my dead mum.
Elton: Did you see the way Gregory Filthwater played last night for the Rovers?
Griff: Why yes he did, he was totally fucking butron.