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1.
Slang term for "all over the place".
"Man, I had the craziest weekend. It was totally grandpa's eyebrows."

"Did you see how that guy was driving? He was grandpa's eyebrows."
by Repent--Harlequin April 21, 2010
 
2.
Grandpas' Eyebrows... their everywhere...

Being all over the place, or crazy. Rarely used for items, more used for people.
Billy shouted at Wanda for no reason AGAIN- Zach

Yeah man hes like Grandpas' Eyebrows- Tyler
by Rock Dagger April 21, 2010