Tom and Bill were both interested in the same girl at the bar; when Tom falsely insinuated to the girl that Bill had erectile dysfunction, that was a dick move.
2. You tell someone named Dick to move out of the way.
3. When someone does a douchebag thing to you.
2. A friend named Dick comes over to hang out. Dick is in the way to where you have to go, so you tell him,"Dick move."
3. A friend does not invite you to a party, but everyone else that you know is invited. You tell that person, that was a "Dick move."
"Yeah, dick move, am I right?"
There can be multiple levels of a dick move. Level one is something minor and insignificant (i.e: Like throwing someone's external HD into the bathtub). Level two is something like that asshole in charge of the Titanic who let it sink, and level three is on par with 9/11.
Some argue that the Holocaust was a Level 4 dick move, but others argue that is was just plain a shitty thing to do.