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Adjective: def  def
  1. (informal) brilliant; very good
    - storming [Brit], blinding [Brit], stonking [Brit], brill [Brit], wicked, cushty [Brit], ace, magic [Brit], smokin', smoking, super, sick [N. Amer]

See also: amazeballs [non-standard, informal], awesome [informal], beaut [Austral, NZ], beezer [UK, archaic], excellent, fantabulous, first-class, splendid, top-drawer

Encyclopedia: Def, Dumb and Blonde