(noun) Horny Alzheimer (háwrnee áalts-hīmerz)
(After Alois Alzheimer (1864-1915), german neurologist)

"Horny Alzheimer" or "Horny Alzheimer’s Disease" (also H.A.D.) is a medical disorder causing dementia when sex is expected: a degenerative disorder that affects the brain and causes dementia (especially late in life or late at night), forgetting all those negative memories or moral impediments you have regarding some questionable partner you had, in order to: get laid, to scratch the old itch, to dance horizontal lambada, etc..
Example 1:
- Hey, Susan! are you really going out with Rick again? Wasn't he the one who cheated on you with your sister?
- I don't remember...
- Well, I do, he also stole your dvd player and still owes me 230 bucks.
- mmm... sorry, I don't follow...
- Yes, yes, he's the one, you even tattooed his name on your shoulder, slut.

- (making common facial gestures in a Horny Alzheimer's Desease patient) really?
- Oh my, I know exactly the name of the disease you have.

Example 2:
- So what do you think about that David Letterman and his assistant, huh?
- All I heard is that they were lovers, right?
- Yes. They say he wasn't married but engaged when he was fooling around with her.
- Drat! H.A.D. strikes again!

Example 3:
- Please, doctor, come quickly! I think my mom's Horny Alzheimer is getting worse...
- Why do you think so?
- Because she had sex with my uncle last week and now she's hooking up with my cousin.
- It doesn't seem that bad.
- And yesterday she was making out with grandma.
- Ok, where do you live?
- 77 Langford street, near Lemontree Park, in the state of...
- No need to tell me, you must be in Texas.
by JUEFELES September 26, 2010
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When you can't find your car in a parking lot because you've forgot where it is. Most of the time you wander around aimlessly until you find it like an older person who has alzheimers diesease.
What's that guy doing just walking around the parking lot like that? He looks like he's got parking lot alzheimers.
by Bull237 September 19, 2010
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The inability to recall a vast majority of the previous night due to the large amount of alcohol consumed.
"Dude what happened last night? I have a case of the Irish Alzheimer's."
by LazyBeardedGuy December 09, 2017
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A insult that is said to people who dont know how they got or did it or just didn't remember.
Jamesthegreat5:How did i get to level 35 i just played.
Gheod2:Welcome back Mr. Alzheimer's
by Spoon ands Bananas April 29, 2018
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An ailment which causes people to accidentally write the wrong year on papers, applications, forms, etc. It is a very common disease that occurs directly after the new year, and can last for several months.

This disease is rarely a problem, since writing the year on most things is pointless anyways. However, serious side effects can occur when tax returns, college applications, etc. are affected.
Teacher: "You've written 2011 on every assignment you've handed in this month. You do know it's 2012, right?"

Student: "Yeah, I just have New Year Alzheimer's."
by uuyb438iubf January 23, 2012
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Irish Alzheimer's is when you forget everything except your grudges.
O'Meara can't remember what day it is but Irish Alzheimers helps him remember he wants to kick O'Hara in the arse.
by T-Bob Corvus December 24, 2017
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