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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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Infantile

To act in a childish or immature manner.
Alex: Today, in class, my friend and I kept laughing then annoyed the teacher. I must do it again soon!
Deeanna: Oh Alex, you're so infantile.
Alex: I know, I can't help it.
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Infantile Pillock

A child-like or child-sized penis.

Infantile: relating to infancy
Pillock: a fool or idiot; a penis
Person1: You're a jerk.
Person2: Butthead.
Person1: Infantile Pillock.
Person2: ... did you just call me a small dick? YOU'RE the infantile pillock.
Person1: Haha.
Person2: What's funny is that you aren't disagreeing...
by princess.peach December 30, 2009
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Infertiles

These are all your friends that don't have kids yet or have chosen to never have kids.
They only invited the infertiles over to the house warming at their new house because they didn't want it trashed by kids.
by rocketrex May 10, 2010
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Infernite

An individual who is unconditionally devoted to the World/Inferno Friendship Society. See also obsessed, fanatic, and arrogant. Sometimes referred to as "kids who like to get drunk and break stuff," though they range from high school-age theater geeks and straight edge vegans to aging punk rockers and art school drop-outs. To become an Infernite, one must first pen 500 posts on World/Inferno's messageboard, attend more shows than anyone else, and have been touched or looked at by Jack Terricloth during a concert. Pics or it didn't happen.
At first I thought I was at some sort of cabaret or klezmer concert, but then the Infernites started stagediving and playing wtih matches. The next thing I remember I was waking up on the beach at Coney Island with a black eye and my purse all full of confetti.
by Miss Nonesuch December 8, 2007
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infernites

the crazy punk rock and gypsy kids that congregate in mass numbers to beat the fuck out of each other and sing their hearts out at world inferno friendship society shows. they often know every line and know exactly when to do the "claw" the especially devout ones will wear fancy suits and vintage party dresses to inferno shows only to get them shredded and doused in cheap wine and beer. some infernites even hold personal acquaintance with the band members
October 31st is Hallowmas which is the night all of the best infernites congregate and celebrate a holiday with no christians or martyrs involved.
by terricloth August 20, 2006
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Infantile Pillock

Dude A: "Why are you laughing at that stupid joke someone just told you?"
Dude B " I really can't help it."
Dude A " You really are acting like an infantile pillock."
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