When a guy doesn't leave the house all day long. He just sits around doing guy stuff. e.g. watching sports/porn; playing video games; eating junk food
Man, my girlfriend is out of town this weekend and I just plan on guybernating. Eating pizza, watching the game, some porn and playing GTA4.
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The phase where a guy has the need to sleep all day for several days. This could be due to a breakup, they constantly have nothing to do, or they're just really lazy.
Similar to Bears and other animals where they sleep for the winter.
Bob: Have you seen Dave lately? I haven't seen him in a bout a week!
John: Yeah, he's in his Guybernation phase.
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Deciding to take a break from guys for an extended period of time.
Elisa: I'm so tired of men... I think I'm going to go into guybernation for a while.
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