Comes from the "Weekend at Bernie's" movies where a couple of idiots drag their dead boss all over the place and convince people that he's alive.
"Shut up bitch. It's bernie, and I'm gonna be swayze."
"So how was Ermelinda in the sack last night?"
"Bernie, man. Like a cold, bernie fish."
"So I hear Grandpa Fred's been circling the drain lately. Did he buy the farm yet?"
"Hell yeah dogg, he's bernie. Cancer."
"Yeah man, Bernie will definitely be there tonight."