A man who is insanely rich, sells guns, likes to smoke and joke with you, but is not very lucky with the women because he has a quick temper. If you mess with him, he'll steal your truck or mug you.
Real definition: James Burke, also known as "Jimmy the Gent", was an Irish American gangster and Lucchese crime family associate who is believed to have organized the 1978 Lufthansa heist
Bill: Damn man, Jimmy Conway just mugged me!
Bob: You might know who he is, but he knows who you are.
This is a look you give somebody or something as you consider whether to kill or end it's existence.
It is an outward sign of malicious intent which the victim can perceive.
It's origins are from The 1989 film "Goodfellas" where the gang boss Jimmy Conway (played by Robert DeNiro) is depicted in a bar staring at his 'crew' and trying to decide whether he should 'whack' them all and keep the stolen money.
CEO: "To be honest, I'm giving the whole sales team the Jimmy Conway stare..."
Ricky: "I'm not sure if it's working out with Julie, I'm giving the relationship the Jimmy Conway stare"
Laura: "this laptop is old and rubbish, i'm starting to give it the Jimmy Conway stare"