Buttermilk

/ˈbʌtərˌmɪlk/

Synonyms

  • butter milk
  • cultured milk
  • sour milk

Slang Meanings

Refers to something that is sour or unpleasant.
That idea was just a big cup of buttermilk.
Used to describe something that is rich or indulgent.
That dessert was so good; it was pure buttermilk.