injective 

An injection is a map f: A -> B such that
f(a)=f(b) => a=b for all a,b in A

The map f: R -> R given by f(x)=ax+b is injective.

Proof:

f(c)=f(d) <=> ac+b = ad+b <=> c=d

Q. E. D.

injective by qsqazxcvfrew March 29, 2018

Jewish by injection

(n.) a term used to describe a gentile, or non-Jew, who engages in intercourse with a Jew one or more times, thereby, becoming somewhat of an honorary Jew of sorts.

"Have you met my new girlfriend?"

"No. She's hot. Is she Jewish?"

"She is now, man. Jewish by injection!"

"Right on!"

Jewish by injection by JAP_ January 11, 2008

bum injection

Having a penis up your anus

Bend over and take it like a man, its bum injection time, pucker up

bum injection by mitch00uk April 7, 2015

Penis injections 

When you slide that nasty sausage in a bun and squirt some ketchup in it.

Penis injections are fun,
I love penis injections

Penis injections by NIKKEN September 7, 2021

Injectile Fart 

When someone farts into a cushioned seat without lifting a cheek thereby injecting the air directly into the cushion which then causes the cushion to retain the fart odor long after the offending Farter has risen.

It is inconsiderate, and disgusting, and strictly prohibited by those who know what it is.

My brother injectile farted into my sofa, causing it to smell of a fart for days.

Injectile Fart by AHGRP August 2, 2010

hot beef injection 

The proper prescription for whatever ails your lady friend.

If excessive talking occurs, administer orally.

Come on Sporto, level with me. Do you slip her the hot beef injection?

hot beef injection by josh February 18, 2003

injection for life 

An exclamation accompanied by an index finger to upper-arm gesture that is quickly self-administered at the first sign of girl or boy "germs". Particularly popular with Australian schoolchildren throughout the 1990s.

Ironically, the injection for life never actually lasted for life, as it was said at every possible opportunity, if not several times a school day.

Jess: Ooh, David just borrowed my eraser and I think I saw him pick his nose earlier!

Stacey, Christine and Sharon: Injection for life!!

injection for life by Ginadean February 13, 2009