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Invertible

In linear algebra, an n-by-n square matrix A is called invertible (also nonsingular or nondegenerate) if there exists an n-by-n square matrix B such that:

AB = BA = I (where I is the Identity Matrix).

Otherwise, in life, it refers to the case where something can be transformed into something else and transformed back.
Randy: Sally is so invertible; real marriage material.

Sandy: I know, nonsingularly so. Put a few drinks in her and you can get her on her back and yet in the morning she still gets up and cooks you breakfast.
by Len Bakerloo July 6, 2016
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Inverted Sloth

The act of masturbating, or performing other sexual acts while hanging upside down.
Dude! I totally just walked in on my roommate doing an inverted sloth on the loft!
by Its late... December 2, 2009
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Inverted Fuckboy

A guy who likes and encourages your romantic attention but sends mixed signals when it comes to whether he feels romantically towards you. The inverted fuckboy will communicate with you multiple times throughout the day, disclose very personal information to you, flirt non-stop, and openly talk about sex but he will NOT make a move to kiss or have sex with you. Unlike the regular fuckboy, the inverted fuckboy will not use you for your body, but for all the other perks of a romantic relationship. Both types of fuckboys, however, refuse to label their relationships or to commit to a romantic interest.
Girl 1: "He's driving me crazy; it's like we're in a relationship except that he never tries to sleep with me!"
Girl 2: "He sounds like the poster child for inverted fuckboys."
by thotbot2.0 July 22, 2018
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inverted starfish

1. Anal prolapse, as a result of excessive entry in the backdoor without sufficient lubrication beforehand. See also pink sock.
"Man, when I pulled out, that shit went all inverted starfish."
by Stacifer December 25, 2007
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Inverted gorilla

by JasonTheCagleGuy March 21, 2019
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inverted seahorse

A sexual position in which a man has anal sex with a girl while she flips under his legs and eats fishsticks from his anus.
Im hungry, wanna do the inverted seahorse?

Imma Inverted seahorse the F**k out of you!
by Sixty-Nine Man March 31, 2008
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Inverted butt cheeks

A person who has an ass so flat, that it actually appears to point inward.
Did you see that girl walk by? She had inverted butt cheeks.
by Llama_Lady November 24, 2009
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