off-the-wall

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌoff-the-ˈwall adjective informal  STRANGEvery strange or unusual, often in an amusing way 稀奇古怪的 an off-the-wall concept 稀奇古怪的观念

Examples from the Corpus

off-the-wall• Barkley was known for his sometimes outrageous and often off-the-wall commentary.• No idea was too off-the-wall, no scheme too madcap.• Extra effects provide various industrial and ambient noises, along with off-the-wall sounds which work well in contemporary rhythmic contexts.noff the wallinformal very strange or unusual, often in an amusing way 稀奇古怪的n Some of Krista’s ideas are a little off the wall. → wall

Examples from the Corpus

off the wall• The noise of conversation from the hall below bounced off the walls around them.• Before I could grasp what was happening, I had bounced off the wall and was crumpling on to the floor in pain.• I jumped down off the wall and joined my sister who was standing behind them listening.• A Whitney Houston tape echoed off the walls.• There's a woman just up the road so I hop off the wall and run after her.• The husband tried to seize a portrait of her, an oil painting, rip it right off the wall.

ˌoff-the-ˈwall adjectiveoff the wallLDOCE OnlineChineseSyllable  

in amusing often an way or Corpus very strange unusual,

off-the-wall
ˌoff-the-ˈwall adjective informal
very strange or unusual, often in an amusing way:
    an off-the-wall concept