A name given to fans of Lebron James by those who strongly dislike him and think he is "lame." The action that accompanies this word is surrounding a Lamebron, saying "Lamebron" repeatedly in a high falsetto voice, and rubbing heads against the Lamebron. This is often done after Lebron James loses a game or has a fail play.
Can also just be used at any random time for any random usage.
"Oh! Kobe Bryant scored 60 points against the Miami Heat. LAMEBRON!"
"You never give me anything for my birthday! You are such a lamebron!"
"I just bit my tongue! This is so lamebron!"