A little less than one year from now, dictionary companies will no doubt be putting "crab dribble" on their annual "word or phrase of the year" lists, but it turns out that the etymology of this little nugget is quite a compelling tale. And believe it or not, James did not just make it up like he's Tommy Flanagan trying to get out of traffic ticket.
Crab dribble is not, as many suspected, the reason they give you a bib in seafood restaurants, but an actual legitimate basketball technique (link to PDF) taught by actual coaches at those basketball camps your parents couldn't afford to send you to. Essentially, it's when a ball handler turns his (or her) back the defender, moving laterally or on a diagonal, while keeping the ball bouncing in between the legs—which are kept crouched and wide apart, like a crab. This helps the offensive player protect the ball against aggressive, high-pressure defenders and makes you sound like an idiot when you try to explain it to the boys in your rec league.
Unless you were talking about the fake Krab they serve at Mongolian Barbecue, in which case you should be suspended for 10 games.
The Crab Dribble (PDF file) [Coaches Clipboard]
LeBron, DeShawn and the Travel [DC Sports Blog]
LeBron Upset His 'Crab Dribble' Was Called a Travel in Final Seconds Against Wizards [Fanhouse]