Ewwww! That is NASTY!

Okay, so I was watching "Scary Movie: 4" tonight. It had its moments, so I am not going to pan it too badly. Hey, it's the same formula as its predecessors, so I knew what I was getting into, right? Anyway, there was a joke that I just didn't get. It was during the "Million Dollar Baby" take-off scene, where Cindy is being prepped for the fight by George. She is facing off with Mike Tyson in a black wig, and George is telling her not to worry, he has faith in her. At one point she says, "Okay, but when it's over will you tell me what my nickname means?", and he promises he will. Then you see her from behind, wearing her warm-up robe, and on the back is emblazoned "Cindy 'Dirty Sanchez' Campbell." Dirty Sanchez? I don't get it. My brother-in-law says, "Well she's had 20 fights and she still doesn't have her own robe." And I pointed out that her name was on the robe. Well, whatever. I finished watching the rest of the movie, "getting" all the other jokes (I think), but I was still puzzled by the "Dirty Sanchez" thing. So on goes the computer, in goes "Dirty Sanchez" to be searched by Google, and out comes...oh man, you have to look it up yourself. All I have to say is, "Yechhh."