Fucking a girl and feeding her tacos at the same time. To perform a true Mad Schafer, one must also shout "Bitch, do you know why they call me Mad Schafer?" Regardless of what she responds, one must then say "BECAUSE I'M MAD!" and then proceed to force feed her more tacos.
The reverse Schafer: Feeding a girl tacos while fucking her from behind.
The lazy Schafer: Having a girl ride you while you feed her tacos.
The dirty Schafer: Basically the same thing as the Dirty Sanchez, except with tacos.
Dude I wanna fuck so bad, but i also want tacos" "Dude just Mad Schafer dat ass