Top Definition
A part of the nervous system that makes a person hungary, girl crazy, get PMS, and makes people irritable.
That bitch needs to get her hypothalamus checked!
by KB February 20, 2004

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a gland that is really resposnible for your feelings.so if the guys say "i love you with all my heart" then reject them. all they want for you to do is to beat for them.
I love you with all my hypothalamus!
by papakuchu at abudabi September 03, 2006

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