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off the wall
Strange, wacky, or unusual. Her hypothesis is really off the wall, but the facts seem to support it. The millionaire investor is a little off the wall, and you never know what he's going to say in the board meetings.
Fig. odd; silly; unusual. Why are you so off-the-wall today? This book is strange. It's really off-the-wall.
COMMON If something or someone is off-the-wall, they are unusual and strange. A few of her ideas were off-the-wall. Note: Off-the-wall is used more often before a noun. He played Melanie Griffith's off-the-wall boyfriend in the film `Something Wild'. Their endearing brand of innocent, off-the-wall humour is as fresh and funny today as it was back in the '50s. Note: You can use this expression both when you like this kind of person or thing, and when you do not like them. Note: This may be a reference to a shot in a game such as squash or handball, where the ball bounces off the wall at an unexpected angle.
mod. strange; improbable; nonsensical. Your ideas are generally off-the-wall, but this one makes sense.