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Adjective: super-duper  'soo-pu(r)'doo-pu(r)
  1. (informal) very excellent; truly great
    "We outlined with a marker the super-duper-triangles created by grouping"

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