Verb/noun.
1) To reduce the amount of log ins into Facebook.
2) To stop using Facebook for an extended period of time, typically ranging from one month to five months
Joey decided to go into Facebook hibernation.

Because the finals are approaching, Susan decides to go into Facebook hibernation so she would be more committed to and have more time to study for her classes.

Jack Facebook hibernated for nearly two months!

by Zeuskog April 22, 2009
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Intentionally or inententionally getting so much sleep on a regular basis that you're able to pull an all nighter when needed (specifically for school projects)
John: hey man did you finish the project?

Bill: yah man I just pulled an all nighter for it

John: aren't you tired?

Bill: no man I was sleep hibernating all week, I fell great
by kz9320 June 20, 2011
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(n.) The process of sleeping untill your brain is mush in the matter of hours, because it's an extreme process that takes bears all winter, which protects their brains, but humans only 6-12 hours.
Billy tried to use extreme hibernation, and now he's in a coma.
by Socretez December 6, 2007
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The tenancy for men to fall asleep after having sex.
Evan: Sorry I'm late, Julie was over this afternoon, got stuck in Fornication Hibernation.

Ryan: It's cool dude, happens to the best of us
by OrangeryWarden March 13, 2011
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The period of time while a woman is on birth control and ceases to menstruate.
Girl 1: Have you started your period again?
Girl 2: No I'm still on vaginal hibernation.
by Kaiser32 May 15, 2007
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When, in a moment of weakness, mother nature calls in a vulgar, disgusting, but creative way.

A hibernating hippo is when someone takes the lid off the toilet cistern and does "number two's", before replacing the lid, leaving the surprise for someone else to find

Hibernating hippo's have been known to go unsighted for days on end, but their smell attracts the interest of many creatures such as flies and small children.
"There's an awful smell in this loo but the toliet seems to be flushed."

"Maybe someone dropped a hibernating hippo - check the cistern."
by The H-Train July 2, 2009
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When a group of at least 3 bears (hairy gay men) have such an exhausting night of sex, they have to sleep for the next three days.
Last night was such a hibernation fest, it will take all winter for my ass to recover.
by HungYoungCub October 3, 2019
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