be mad keen

be mad keen (on someone or something)

To be very enthusiastic or excited about someone or something. Oh, I've seen the way Tim smiles at you—he's definitely mad keen on you! I'm mad keen on that college, so I really hope they accept me.
See also: keen, mad, someone
Farlex Dictionary of Idioms.

be mad ˈkeen (on somebody/something)

(informal) be very interested in or enthusiastic about somebody/something: She’s been mad keen on African music ever since she came back from Zimbabwe last year. He’s mad keen on getting into the army.
See also: keen, mad
Farlex Partner Idioms Dictionary
See also:
  • be mad keen (on someone or something)
  • interest
  • get mad at (someone or something)
  • get mad at something
  • have a keen interest in
  • have a keen interest in (something)
  • make (one) mad
  • make mad
  • get mad
  • be (as) mad as a hatter
References in periodicals archive
Flanker McCaw said: "Whoever has been picked, these guys are playing for Scotland and they will be mad keen to prove themselves.
Rugby Union: Dickinson defies his disbelief; RUGBY WORLD CUP 2007 TODAY'S GAMES SCOTLAND v NEW ZEALAND GROUP C EDINBURGH, 4pm