old sport

old sport (plural old sports)

1. A term of endearment used to a friend.
   • 1925, F[rancis] Scott Fitzgerald, chapter 7, in The Great Gatsby, New York, N.Y.: Charles Scribner’s Sons, published 1953, →ISBN, →OCLC:

     "Why not let her alone, old sport?" remarked Gatsby. "You're the one that wanted to come to town."

• drop lots