con man
Back formation of "confidence man". One who gains the trust, or "confidence", of his victims (often called marks) in order to manipulate, steal from, or otherwise predate upon them. (U.S. slang, late 1800s)
Don't write him a check, he's a con man .
Con-Man
Great nickname for someone named Connor
Person 1: hey, my names Connor
Person 2: Nice, I’m gonna call you Con-Man
Person 2: Nice, I’m gonna call you Con-Man