The pineapple represents hospitality and welcoming. A pineapple is placed on a porch or mail box by swingers to signify that a swinger party is going on. A pineapple is turned upside down when a person is in search of a swinger party. Originally it was turned up side down in the individuals shopping cart. But pineapple popularity has made it accepts on clothes and other items. Swingers use this symbol to identify each other in public.
My neighbor left an upside down pineapple on my porch last night. I think he wants to swing.
by Starrydreams001 August 18, 2017
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The act in which a male, during 69, ejaculates on his partner's face and then immediately flips her off of his body. He must then immediately grab a handful of glitter (which he had in his hand, pocket, or on the bedside table) and "cast" it into his partner's face. The glitter will adhere to the partner's face, leaving her "under his spell". The male can then, if desired, yell "EXCALIBUR!" at the top of his lungs.
"So how was it with Gabi last night?"

"Oh man, she had no idea, I pulled off the Upside-down Merlin. That bitch is totally under my spell."
by The Wizard of Cock April 26, 2009
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A frown or a mug, especially at somebody. It can also be a smirk.
Take your upside down smile and shove it.
by Mr. Terrence L. Trezvant September 8, 2007
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The act of fondling a Mans or Woman’s crotch with your fingers.

A Sexual maneuver that uses the hands to play with a persons genitals.

Pretending to play the Piano Upside Down in the Crotch area of another person.
(Duke)"Last night when i came home Torri gave me The Upside Down Piano"
(Dorian)" Wow what song did she play?"
by MC30 February 22, 2008
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Engaging in a frustrating pursuit that consumes more effort that it is worth. The idea is that "pissing upside down" is an ineffective way to do something very simple, and likely results in getting wet.

See Struggle-Bug
"I just wanted to get a quart of oil out of the garage but I bumped the boxes of scrapbooking supplies, which knocked over a bottle of brake fluid that split open and is getting everywhere. Now I'm pissing upside down."
by skippy123456 January 31, 2009
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The act of deficating in an explosive manner. This is usually a diahrea dump resembling a volcanic eruption, upside-down.
I just took the worst shit ever. It was an upside-down volcano.
by ruppge November 13, 2007
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