A bosom buddy is a very close, intimate friend, one who's always got your back and who you do and share everything with—a BFF.

Is bosom friend a real word?

Meaning of bosom friend in English

A bosom friend is someone you can be very close with and confide everything in. We were not exactly bosom buddies but we always got on.

What does bosom mean in slang?

It is also poetically considered to be the place where our feelings reside. Used as a verb or noun, bosom originates from the Old English word bosm, meaning "breast, womb, surface, or ship's hold." It is commonly used as a polite reference to a woman's breasts.