The term "off-the-wall" is a valid expression in written English.
It can be used to describe something which is unexpected, bizarre, or unique. For example, "The professor's off-the-wall teaching style was a welcome change from the typical lecture format."
Idiom
Off the wall.
Something that is off the wall is unconventional.
Dictionary
Exact(6)
This isn't an off-the-wall question.
Sometimes, though, an off-the-wall outfit works.
His last, typically off-the-wall, venture was Snoozebox.
"That's just off-the-wall".
That's an off-the-wall proposition.
Paul Walker's off-the-wall action in 'Brick Mansions' trailer.
Similar(52)
He's just off the wall".
Because the idea was off the wall.
"This is totally off the wall!
They took pictures off the wall.
"They jump off the wall like paintings".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com