What is a mustache ride?

A mustache ride is a slang term for oral sex, particularly when a man's mustache comes into contact with a partner's genital area during said act. The term is often used humorously or in a joking manner to refer to this sexual activity. It can also be used as a way to tease or flirt with someone. It is important to remember that all sexual activities should be consensual and mutually enjoyable for both parties involved.