(hardy) har har

(hardy) har har

A sarcastic or unenthusiastic impression of a laugh, used to indicate that one thinks some joke or quip was not funny. A: "What did the surfer say about the London Underground? 'Totally tubular, dude!'" B: "Har har, Dad." A: "Man, this class is tough." B: "Yeah, who knew molecular would be so complicated?" A: "Hardy har har, very funny."
Farlex Dictionary of Idioms.
See also:
  • You call this (something)?
  • sarcasm is the lowest form of wit
  • get back at
  • get back at (one)
  • I can wait
  • not a (whole) lot
  • not much
  • not going to win any beauty contests
  • sorehead
  • let's not and say (that) we did