what is blinker fluid? とはどういう意味ですか?

質問を翻訳

Blinker fluid isn't real. It's supposed to be fluid you put in your car to make the turn signal work, but nothing like that exists. People use it to make fun of others who don't know how cars work. If someone believes that blinker fluid exists, then they don't know enough about cars and will be laughed at.