We know squirrels hibernate, and they dig in the dirt to hide their nuts... So... The Hibernating Squirrel is when you are doing a chick doggy style in the ass(Digging in the Dirt) and you tuck your balls inside her vagina (Hide your nuts)
"yo dude did you bang that broadlast night?"
"Yeah man, I gave her the ol' Hibernating Squirrel!"
In StarWars its when your in carbon freeze for too long and your all disoriented and you cant see. These symptoms pass with time. In the real world its when you sleep for too long and your all groggy, headachey, and have blurred vision. Also passes w/ time.
Dan: Dude i nodded off for a quick jedi nap and i woke up w/ hybernation sickness.
In addition to being a situation in which two people date so exclusively that you rarely see them, the hiberdating couple will make occasional public appearances. During these appearances, the two will never acknowledge anyone but each other, never stop touching/caressing each other, and will annoy the living piss out of anyone and everyone in their vicinity, especially used-to-be friends of the hiberdaters.
Wanna go hang out with Kenny and Marissa?" "Sure, if you want to puke your guts out listening to them talk goo-goo to each other... they've reached hiberdating status ever since Kenny refused to take his hand off Marissa's knee during Science class