What does the trash can on your head mean?

An expression pack with a trash can on your head indicates mischief or just shame. In short, it is a derogatory term and has a bad image.

Garbage can, also known as waste box or dustbin, refers to the container for putting garbage. Most of them are made of metal or plastic. When they are used, they are put into plastic bags. There is too much garbage, so you can tie it up and throw it away.