Failogy 

Using flawed logic to arrive at an incorrect conclusion.

Apples have sugar, and they're good for me, so sugar must be good for me too!

Dude, that's total failogy.

Failogy by TrueChaosIncarnate April 26, 2019

Failony

A crime in which you commit an intense fail.

You've just commited a failony, we're taking you in.

Failony by Donald M February 1, 2009

failogeny

any phylogeny that is incorrect because the person creating the phylogeny failed and did not use correct information

My professor drew a failogeny when he decide to say mice or outside of the clade containing primates and carnivorans

failogeny by leftisthominid February 18, 2011

Failony

A fail so epic, the perpetrator of said fail should be incarcerated.

Rich: "Hey, do you know how far Russia is from Alaska?"

Dan: "Not exactly. I think they're pretty close though; Sarah Palin said she could see Russia from her porch."

Rich: "And you believed it? Dude, failony."

Failony by cobrawannabe November 6, 2010