A mental illness that makes a person constantly change their gender or makes it impossible to concretely define their gender.
He was diagnosed with gender dementia.
by Mochi101 September 20, 2021
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Coined by Ross Scott of Accursed Farms, it refers to when a video game makes you feel insane because something which you've done/seen before is now suddenly completely dfferent, or no longer works for seemingly no reason.
Jack: So how was Sonic Heros?
Ronald: God, so mixed, it was giving me serious Gamer Dementia!

Jill: Did you get through Hellgate London at all?
Steve: Fuck no, it seemed like I was going insane, stuff was randomly changing!
Jill: Sounds like it was giving you a real case of Gamer Dementia!
by basicallyHal October 31, 2020
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The same condition as senile dementia, however describes the condition when it occurs before the age of 65.
Idiot: I think the fact he is placing these objects in such places is due to the Alzheimer's causing senile dementia, we'll have to keep an eye out for Disorientation and Memory loss as well as changes in personality, thank god im chief lecturer at Harvard.
Me: You're a twat, its presenile dementia he is only 64.
by kampin_bunny August 13, 2006
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noun.

The momentary lapse of self-awareness one experiences after prolonged mobile device usage suddenly leads to a blunt snap back into reality. Symptoms include, but are not limited to deterioration of short-term memory, sense of direction, motor functions, speech, and courtesy. Mobile Dementia, or Mobile Mania as it is known in many public transit systems, can last as little as a few seconds or as much as a full minute while the inflicted try to figure out where the fuck they were going, how to fucking get there, and who the fuck they think they are.
That guy in the suit was frantically typing away on his blackberry until we reached the end of the line. When the train doors opened he was struck by Mobile Dementia and started looking around like he wasn't sure he was suppose to be on a train in the first place. Instead of stepping aside to let the rest of us off, he spun around in circles and slowly made his way to the stairs. He made it all the way to the top when the mobile dementia wore off and he realized he had missed his stop and needed to go back.
by Pop Culture Guru March 5, 2010
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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 5, 2011
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a type of dementia that occurs when one holds a poop in for too long and develops a very shitty attitude
Bus Driver- "everyone shit out your Taco Bell now we have an 8 hour bus ride ahead of us and i dont want anyone developing poop dementia on my bus"
by Mr.Ham November 23, 2010
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When you check your Blackberry constantly because you swear the "Notification" light was flashing, only to learn that it wasn't.
Jake: Damn, why are you always checking your Blackberry at work?

Derek: I don't know. Sometimes, I swear the light is flashing. But most times, it is not. I definitely have Blackberry dementia.

Jake: Why don't you just wait and see if the light flashes again?

Derek: Why? Fuck you! That's why.
by Still Stan March 9, 2009
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