1.
If you describe something as off-the-wall , you mean that it is unusual and rather strange but in an amusing or interesting way. ( INFORMAL )
...surreal off-the-wall humor.
ADJ : usu ADJ n
2.
If you say that a person, their ideas, or their ways of doing something are off-the-wall , you are critical of them because you think they are mad or very foolish.
It can be done without following some absurd, off-the-wall investment strategy.
ADJ [ disapproval ]