Liar and a cheat
The opposite of Gentleman and a scholar. That is, a joking diss. Often used to refute the claim that someone is a Gentleman and a scholar or vice versa.
Jack: I can't believe you did that, that's low...
Bob: What ever do you mean? I'm a gentleman and a scholar!
Jack: You sir, are nothing more than a Liar and a cheat.
Bob: What ever do you mean? I'm a gentleman and a scholar!
Jack: You sir, are nothing more than a Liar and a cheat.