Kamina Assumption 

noun; an assumption that any situation or problem, even if it is logically insurmountable, can be resolved by sheer passion or force of will.

This phrase was inspired by the character Kamina from the anime Tengen Toppa Gurren Lagann, who has a tendency to conquer insurmountable obstacles by his fiery, manly passion; a force that is approximately equal to the red-hot plasma of a thousand suns molded into the shape of mustangs and panthers.

Kevin: Look, I know that we only have half a tank of gas and no cash, but it's my dream to finish this cross-country road trip and I know we'll do it somehow!

Me: Considering that we're still in Wyoming, I'd say you're making a dangerous Kamina Assumption.

Kamina Assumption by PyrgusMalvae January 18, 2010

Disingenuous Assertions 

Disingenuous: lacking in frankness, candor, or sincerity; falsely or hypocritically

Assertion: positive statement or declaration, often without support or reason: a mere assertion; an unwarranted assertion.

put the two together and you have Disingenuous Assertions so I'll dumb it down for you people

Disingenuous Assertions: pretty much lying to make someone look good and something that so infuriating that it makes soldiers want to punch reporters

I've had enough of your disingenuous assertions

Disingenuous Assertions by Bushyfro September 29, 2011

mann's assumption 

assuming that everything in a hotel room has at one point been in someone's rectum.

Don't touch the remote in your room - you know Mann's assumption tells us that thing is nasty.

mann's assumption by dj jazzy jason June 22, 2012

Vegans Assumption Fallacy

A vegan must never assume that something is vegan unless and until it's confirmed to be vegan.

A vegan realised that he/she consumed a non-vegan product by failing to check the ingredients label, therefore falling prey to "Vegans Assumption Fallacy".

Vegans Assumption Fallacy by Vegan1116 January 13, 2023

Like-assuming 

When someone press the Like button on facebook, and you are going to check who liked someones comment, you assume who the liker is. The liker is usually the statuswriter or the poster of something, if someone gives a positive comment towards them.

Like-assuming:

Person A writes a status on facebook: Oh i just won 100 bucks on betting.

Person B writes on the status : Thats because you are so good at betting.

Then when someone likes Person B's and you dont know who it is, you check it, and right before you drag your mouse over the button, you assume it is Person A who likes it because the comment was ment positive towards that person.

Like-assuming by facebookliker69 April 28, 2011

Assumption Asshole

Someone who assumes something negative after a general phrase, to either bring you down or be an asshole.

I'm gonna go outside.

You can't skateboard outside because it's wet dumbass...

I was gonna go for fun you Assumption Asshole...

Assumption Asshole by Kyle Loveless April 4, 2010

Assuming Harkness 

Speculating on something that is actually inevitable; as good as fact.

"Well, assuming Harkness, they'll end up sleeping together"

Assuming Harkness by NikeAgXY December 30, 2011