The Han Solo occurs when you are sitting across a table from a lady at a seedy cantina (although a restaurant will do in a pinch). You then jizz on her under the table. Congratulations, you have completed "The Han Solo." Make sure if there are any other guys present, you jizz first.
"Hey, John. So we were out at Romano's earlier and I totally pulled The Han Solo out on Rebbecca. She was pretty pissed when she found out. Yeah, as a matter of fact, this is my one phone call. You know a lawyer?"
The Chewbacca occurs when you are having sex with a girl, and, in the heat of passion, you pull her arms out of their sockets.
"What the fuck, Jason, why are there two human arms in your bathtub?"
"Oh, I pulled The Chewbacca last night. Damn shame, third time this year. Sprinkle some more lye over those things while you're in there, by the way. "