The opposite of insomnia. When one is unable to wake up or just can not seem to stop sleeping.
My mother tried to get me out of bed this morning but she couldn't due to my severe outsomnia.

Bill is always sleeping, he must have outsomnia.
by Eksist January 01, 2009
the opposite of insomnia, not being able to wake up, a hard time getting up
Nikki: i have insomnia
Matt: i have outsomnia, i can sleep for days.
by nikkisass. July 30, 2009

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