Originates from the Dirty Sanchez. When someone craps on their partner's face, then sprinkling sand on the crap. Finish off by ripping out your pubes and sprinkling them on the crap. Thus, making the partner look like Chewbacca.
Bob started out giving Sally a Dirty Sanchez, but decided to make a Sandbacca.
di Osmando93 01 marzo 2009