Yes!

Yes!

interj. Absolutely yes! (Always with a special intonation that holds the y on a higher pitch and then drops the pitch sharply. The word itself is not slang, but the word with this intonation is part of many slang contexts.) Yes! Exactly right!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • fettie
  • bluh
  • bousta
  • Hey!
  • lucci
  • horseradish
  • base
  • stir
  • late
  • bout it