Hippokrampus 

That part of your brain that gives random, sudden urges or thoughts to commit a despicable act. Your hippocampus fights the hippokrampus daily.

I saw a toddler the other day and thought "I could just punt this thing right now." I guess my hippokrampus must not like children.

Hippokrampus by Communist bloc party February 17, 2018

Pandorum Hippocampus 

A clinical and medical term for having the same dream every night, without change.

Suzy Smith has been dreaming the same dream, everynight, without fail for some 15 years. She has the symtoms of Pandorum Hippocampus.

Pandorum Hippocampus by dirkdavid33 March 19, 2010

hippocampus 

noun. plural, hippocampi

In anatomy, the hippocampus is an elongated ridge of the brain, found in each lateral ventricle (and shaped a bit like a seahorse or whale). Its function is believed to be the center of emotion, memory, and the involuntary actions of the nervous system.

People with Alzheimer's disease are shown to have damage to their hippocampus, which leads to memory loss and disorientation.

Humans have two hippocampi, one of each side of the brain.

hippocampus by Christina S January 5, 2012

indelible to the hippocampus 

When you're scared AF and remember it forever.

I was bullied in kindergarten. That kinda shit is indelible to the hippocampus.

indelible to the hippocampus by MaryinPgh October 8, 2018

hippocampus 

A school specially designed for hippopotamuses.

I went to the hippocampus instead of the zoo.

hippocampus by deewen December 3, 2019

Hippocampus 

Where african water animals go to get their education.

It's actually the memory processing center of the Lymbic system in the brain. Hippocampus

Hippocampus by MrLongley November 4, 2012

Hippocampus moment 

That moment you reach a place and realise exactly where you are. It reflects the moment where your hippocampus (the brain structure involved in memory and navigation which stores maps of the environment you have visited before) recognises that you have been to a place before and merges two cognitive maps together (one map made when you visited in the past and the map made in the present).

I am used to go to the supermarket by taking Broadway, but yesterday I was on South street and reached the supermarket. I had a hippocampus moment! I realised South street leads to broadway!

Hippocampus moment by KindHippocampus August 15, 2017