loony tune/tunes/toons

n, adj

(a person who is) mad or eccentric. Originally an Americanism derived from Looney Tunes, the name of a series of cinema cartoon comedies in the 1940s, the term has become fashionable since the 1980s in Britain and Australia.

► 'I've been hit twice in the face this morning and now some loony tune is breaking up my aircraft.' (The Flying Doctors,

Australian TV series, 1987)

► 'That is it, Mork! He's got to go, or I'll end up as loony-tunes as he is.' (Mork and Mindy, US TV series, 1979)