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1.
When you engage in anal sex on a beach.
I took my girlfriend to Ocean City for a Malibu Mudslide last night.
by bertram jennings March 08, 2010
 
2.
The act of setting a girls ass hair on fire & then pissing the fire out, then stir ass with cock.
Cheryl was extra kinky. She grabbed the lighter, bent over and screamed for a Malibu Mudslide.
by Anon 777 December 12, 2007