loony tune

English

Etymology

Probably after Looney Tunes cartoon characters, because these characters are noted for their silliness.

Pronunciation

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Noun

loony tune (plural loony tunes)

  1. (slang, humorous) A silly or crazy person; a person whose actions are unpredictable and irrational.
    Some loony tune parked his car in the no parking section.
    Stop fooling around like a loony tune and get to work on your essay!

Alternative forms