Used by Phillip J. Fry from the TV show "Futurama" to describe sex.
Leela let's ditch these aliens so they can do the Sideways Monster Mash.
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The vagina. Described as such because of its likeness to a monster's mouth, but rotated counter-clockwise ninety degrees into a vertical position.
"Oh my god. There I was drinking my vodka-cran while she shaved her sideways monster mouth..."
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When you take a shit and it ends up sideways in the toilet and it won't flush so you have to attack it with a toilet plunger
"The Sideways Monster has struck again"