Comes from the 1989 film "Weekend at Bernie's"
It's when you fall asleep sitting in a chair of some sort i.e. desk or couch with sunglasses on. The best ways to pull a Bernie are to stay loose and fall asleep with some sort of neutral grin.
Andrew: Look's like Jake is passed out in the middle of class.
Will: Nah man, he's pullin' a bernie.
by Always Hyphy May 5, 2011
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