Excellent!

excellent

slang Great! Awesome! My package is here already? Oh, excellent! A: "OK, I'll give you guys a chance." B: "Excellent—you won't regret it!"
Farlex Dictionary of Idioms.

Excellent!

exclam. Fine! (Like awesome, this expression is a Standard English overused in slang contexts.) A new stereo? Excellent!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • excellent
  • amaze
  • amazeballs
  • bitchin
  • bitchin'
  • bitchin’
  • awesome
  • awesome sauce
  • berries