A close friend or companion; someone with whom one shares a strong bond or camaraderie. noun
I've known him since childhood, he's my best buddy.
She went to the movies with her buddy from work.
A term of friendly address used to refer to someone, often in a casual or informal manner. noun
Hey buddy, how's it going?
Listen, buddy, I think you dropped this.
To become friends or to form a close relationship with someone. verb
They buddied up during the school trip.
He quickly buddied with his new teammates.