The act of giving a sexual partner a shocker and then using your shit-stained pinky finger to give her a dirty sanchez after the sexual act is completed.
"Yep, Carol, he gave me a Mexican shocker... he stuck two in the pink and one in the stink, and then smeared his pinky finger across my upper lip. What a guy!"
A sexual act involving rubbing raw chili's all over your hands, and performing a shocker on a willing (or unwilling) participant.
I've had the clap before but nothing burns worse than a Mexican shocker!