wacko

怪人、疯子口语，贬义

Some wacko has been leaving strange notes on my car.

有个怪人一直在我车上留下奇怪的字条。

古怪的、疯疯癫癫的口语

He came up with another wacko plan to get rich quick.

他又想出一个古怪的快速致富计划。