To fail spectacularly
To totally check out when the situation calls for action;
To take a backseat in the action.
To perform very badly in clutch situations
Friend 1: Dude, what happened when you went back to that chicks place?
Friend 2: Everything was perfect. It was go-time, and I just Lebronned the whole thing up.
V: To have a sports star leave what he claims is his hometown due to a perceived lack of accomplishment. These failed accomplishments may be championships, MVP awards, or wins against a heated rival. While the above reasons are most often mentioned in leaving, many times it's for nothing but increased pay or notoriety.
Did you see how bad he Lebronned Cleveland last night?