People use this to describe their daily struggles, in particular in regards to overcoming financial difficulties. When you are "en la lucha" life is difficult, and you are fighting to win.
Put a wrestling mask on a girl. Wrestle with her, put her in a sleeper hold and while she is out, bust a nut in her eyes so she cannot open them when she wakes up rendering her blind. (Can also be called the Crusty Lucha Libre)
I was wrestling with your mexican mom last night - put her in a sleeper hold by "accident". I felt it was my moral obligation to give her a blind lucha libre. The crust cums off with a little vaseline.