When a guy has sex with a girl, cums in his hand and then throws it up in the air like the chalk clap Lebron does getting it all over her. And then says to the girl "You've been Lebroned Bitch."
"I pulled The Lebron on that chick last night."
When a girl is almost done sucking you off, instead of finishing in her face you finish in your hands. Next, you take the collected giz and you imitate Lebron James, thrusting your hands and arms upwards, launching the splooge right into the girl's chin. Clap your hands 2x and you have successfully completed The Lebron, congrats!
Man, I was feeling balla last night, so I gave that bitch The Lebron.