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1.
A term used in the show Metalocalpyse on Episode 1.4 (Dethtroll) by Toki and Skwisgaar to describe old-fashioned, ancient, out of style accoustic guitars- which according to them, should be avoided at all costs because they're apparently for pussies and grandpas. It can be used in the singular and plural sense, due to its pseudo-Nordic roots.
Murderface: What are those wooden things? Chairs?
Barkeep: They are acoustic instruments.
Toki: What is acoustic? Oh, you mean a grandpa's guitars?
Skwisgaar: A grandpa's guitars? That's for pussies and grandpas. I think you know it.
Barkeep: It's your only choice, I'm afraid.
Pickles: Whoa, this is a tough one guys.
Nathan: Pickles is right, we have a tough choice. Playing acoustic is totally lame and not metal. But then again, if we don't put that troll back to sleep, we may never be able to check our e-mail with high-speed DSL again.

Toki: THE GRANDPA'S GUITARS ARE SMASHEDS!!
Skwisgaar: (referring to lake troll) Dudes, here comes that guy!
Nathan: Wait! The phones! Use the Dethphones! Throw them at that guy!
by VioLush April 23, 2007
 
2.
the term used by Tokie and Skwisgaar for acoustic instruments.
Grandpas guitars are for pussies, and grandpas and I think he knows it.
by not will hensley November 15, 2007
 
3.
An acoustic guitar, most commonly used by grandpa's and pussies.
We can't play those grandpa's guitars, they are totally lame and not metal!!
by Mike Nap November 29, 2007