The long neverending demented cartoon movie that lasts almost like, half a fucking HOUR, damn you! I hate myself, go to hell. 400000004!

I don't know, I'm just really, really drunk.

You looked this up?

by ACDC FOREVAR!!!111 May 19, 2004

Penile Dementia

The phenomenon whereby your penis will urinate anywhere but where you're aiming.

Possible causes are sex, sitting uncomfortably, and having a foreskin.

Jerry: Dave, why is the ceiling wet?!
Dave: Sorry, I had penile dementia.

by Locus0mega March 29, 2011

Dementor

A girl who gives really good head, but her very annoying personality slowly sucks away your soul.

Bro 1: Bro, Jasmine gives crazy head. Matty is so lucky.
Bro 2: No way bro, she's a dementor,

Bro 1: What does that mean?
Bro 2: It means she's fucking crazy.
Bro 1: Oh, that would it explain why Matty never wants to hang with us anymore.

by Titus Blowhard September 2, 2010

Dementors

Creatures of everlasting darkness. These creatures are the only things born evil.

Just being in proximity with a dementor drains all happy thoughts away from. They make you relive your worst memory.
They also take away anything warm, whether they be thoughts or the accual tempature.
They are also some of the only creature that do not sleep, they also never walk. They are the only known creature that can suck the very soul from a living thing.
Because of these special abilities they are used as gaurds to the wizard prizion of Azkaban.

The only know way of fighting a dementor is to use a petronus charm.

When thoses Dementors came by..........i nearly pissed myself.

by Phantomdeath August 1, 2009

Demented

1. Entirely irrational: Completely unreasonable or lacking any sense of the consequences of actions taken.

2. Affected with dementia: Affected by the loss of intellectual functions that is associated with dementia. This usually only happens to elderly (old) people.

My friend's granpa is demented, he can't remember a thing.

by Jafje April 5, 2007

Dementor's Mouth

Very dilated anus from fisting and other perverse practices. So called because it can dilate to an irregular shape, like the mouth of a Dementor (fictional humanoid from the Harry Potter books).

Fisting is just gross and will give you a Dementor's Mouth

by Nemia December 11, 2010

Dementiac

Describing someone who has symptoms of dementia such as difficulty with many areas of mental function.

Hey bro, you are being mad dementiac!

by Rasta Monsta September 2, 2011