diss on someone

dis(s) (on someone)

(ˈdɪs...)
in. to belittle [someone]; to show disrespect [for someone]. (From disrespect.) Gary is such a complainer. All he does is diss.
See also: diss, on, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • fettie
  • bluh
  • bousta
  • Hey!
  • lucci
  • horseradish
  • base
  • stir
  • brutal
  • doje