Namesis 

Your namesis is someone with the same name as you.

Dude A: "It's crazy - I went to meet our ad agency today and there's a guy there with the same name as me. He's got a stuffed cat on his desk and he's clearly much more interesting than me".

Dude B: "That's your namesis man, you're in deep trouble."

Namesis by Skipperton March 17, 2011

Namesis 

Someone with whom you cannot stand because of their name

I've never gotten along with a Jessica... Must be my namesis.

Namesis by greenie1975 April 23, 2015

Museum Nemesis

When visiting a museum or gallery, you will encounter at least one Museum Nemesis. These are the people that you see over and over again that inconvenience you repeatedly during your visit. You can tell your Museum Nemesis by some of the following traits:

-They will prevent you from seeing displays by getting up close to them, blocking your view
-They often bump into you by stepping backwards without looking. They will rarely apologise or even make eye contact after doing so
-You will never lose them. Even when you think you've lost them, they'll turn up at the next display you wish to look at
-When visiting the museum cafe they will be in front of you in the queue. They will almost certainly take the item you wanted, and it will be the last one

You museum nemesis can often be defeated by an 'accidental' tripping down some stairs. Museum stairs are often made from marble or other very hard stone.

Jim: That stupid bitch got in my way AGAIN!

Bob: Yeah man, that's your Museum Nemesis

Jim: How I get rid of her?

Bob: Trip her down some stairs, that's how I got rid of mine

Jim: You mean that screaming kid you said just fell over?

Bob: That's the one!

Jim: ...Awesome!

Museum Nemesis by Danno81 June 8, 2010

nemesis 

A righteous infliction of retribution manifested by an appropriate agent.
Your worst enemy.

Lex Luthor will always be Superman's nemesis

nemesis by Kryl June 27, 2004

Nemesis Law 

When a person thinks a facetious statement is a genuine representation of a rival ideology due to their own limited worldview.

Named for the Greek figure Nemesis, who lured Narcissus to the pool where he drowned himself trying to be with his own reflection. A counter to Poe's Law.

Asshole: “Look! This gay person on Twitter says that straight people should be made into cat food! The gay agenda is real and violent!”

Reasonable Human Being: “Dude, they’re obviously joking. Calm down.”

Asshole: “…Well, how was I supposed to know? Maybe this person is joking, but most gays say things like this and they mean it!”

Reasonable Human Being: “Have you ever met a gay person? Or are you pulling some Nemesis Law bullshit?”

Nemesis Law by halfsyproblems December 27, 2016

Fuck Nemesis

Like a fuck buddy except this person isn't your buddy in any way shape or form. You have nothing but contempt, loathing and disgust for each other as people. Yet you call them or receive a text from them every time you're lonely or they're horny and you get it on. There will be no talking, except to trade insults. You will have no need to discuss "keeping this a secret" as you're both too ashamed to reveal this to anyone.

Ex's, long term partners and co workers can all become Fuck Nemeses.

"Dear Diary,

I felt sad and lonely so I called Clive to come over and we had sex, after he called me a fat bitch. Oh, I need a boyfriend, not a fuck nemesis."

"Can't be bothered to try and pull or be nice to anyone. Time to call my fuck nemesis"

Fuck Nemesis by MagickDio February 18, 2010

Nemesislessness 

The state of having no nemesis.

"I'm not sure why I would be sent this death threat; existing as I do in nemesislessness."

Nemesislessness by pardalote December 15, 2008