That might not be the best nickname to have!
This book came out in 1952. It was published by Ecstasy Novels, which probably tells you all that you need to know. The cover was later reused in 1959 for Private Club, which was written by Orrie Hitt. While the identity of the artist is not known, they did a good job with this cover, strategically placing the girl (Easy?) so that it’s impossible to tell whether or not her friend with the cigarette is wearing a bathing suit or not. Maybe he should be nicknamed Easy!