The huge sand monster from the movie Star Wars: Return of the Jedi, that Jabba the Hutt tried to feed Han Solo and Luke Skywalker to. The creature is always stationary, lying in wait in its sand pit with its toothy lamprey-like mouth just sticking out, ready to swallow any careless human or animal that tumbles and slips down the sand pit. Tentacles surrounding the mouth grab whatever human or creature they sense nearby and then pull the helpless meal down the Sarlacc's maw. Once the person or creature is swallowed by the monster, he/she/it will undergo a new destination of pain and suffering as he/she/it is slowly digested over 1000 years.
The term "Sarlacc" can also be used to describe any vagina that has a wider diameter than the average diameter of any known vagina. Kinda like the female counterpart of a chode.
2. When I was getting laid with my girlfriend, I realized that my penis couldn't fit in tightly because she had a Sarlacc. I could however, fit my whole hand into the wider-than-average vagina, therefore providing her with intense orgasming pleasure, as her G-spot was so goddamn easy to access.