Crazy. Karma is a b****.. Gets you every time. Its not good to wish bad on anybody. God sees everything!
Most people widely interpreted it as James retort to Cavs owner Dan Gilbert, who used the word karma in trashing James in a letter to the fans Gilbert published after James left for the Heat.
Today, Lebron is claiming "It wasn't even a comment from me, it was someone who sent it to me and I sent it out." But a search of Twitter doesn't show a tweet of that wording from anyone prior to Lebron's version, the usual Retweet indicator was absent, and Lebron didn't use the RT attribution that's become a de facto standard on Twitter to indicate a manual retweet.
I think most everyone will accept this as a technological Freudian slip on James' part, and revealing of his feelings about how the Cavs reacted to his departure.
One more way Lebron is not like Michael Jordan: he is terrible at PR. Not that I'm complaining. The sports world is a more interesting place with athletes one cell phone button press away from sharing their inner thoughts, unmediated by PR reps. And at least, unlike Palin with her target maps images which she claims to stand behind, Lebron has left his tweet live and public.