toot / blow one's (own) horn

What is the origin of the idiom "toot one's horn" and when to use it?

The idiom "toot one's own horn" originated from the act of musicians playing brass instruments and creating a sound by blowing air into the instrument's horn. It is used to describe someone who boasts about their own achievements, skills, or abilities, often in a self-promotional or self-aggrandizing manner. The idiom suggests that the person is seeking attention or praise for themselves and is not modest about their accomplishments. It is typically used to convey a sense of disapproval or criticism towards someone who excessively brags about themselves.