Technique used mainly by males to sleep in the same quarters (Bed, Couch, etc.) without having the threat of gay/awkward encounters. The two will lay in opposite directions (feet next to head) mirroring the position used in the movie Willy Wonka and the Chocolate Factory by Grandpa Joe and the other geriatrics in that beat on shit-hole house.
I was Grandpa Joeing on the couch with Raff yesterday watchin golf

Yo I dont have anywhere to sleep, you mind if I Grandpa Joe with you.

I slept with Jim, its cool tho we Grandpa Joe'd
by T$SS March 13, 2011
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(n). An old man wearing clothes from Hollister.
Look, it's Grandpa Hollister! It's a shame he's drooling all over that shirt.
by Wog September 3, 2007
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Pure Beast...ANIMAL...Extremely non grimey
WOW...You are acting like a true Grandpa Ed
by SHERIFF JOHN NADGE March 3, 2005
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When you fuck each other with a copious amount of breaks to complain about aches and arthritic problems.
God, Sheila and I were grandpa style-ing so hard last night my dentures fell out.
by s-d@wg May 23, 2016
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An acoustic guitar. can also be used to refer to any acoustic instrument such as a lute or a mandolin. Skwisgaar & Toki from the show Metalocalypse use this word several times.
Bartender: You must play a song to put the troll back to sleep.

Skwisgaar: Hey, douche bag, how the hell we gonna play with no electricals? Think about it.

Bartender: Come with me.

Murderface: What are those wood things, chairs?

Bartender: They are acoustic instruments.

Toki: What is acoustic? Oh, you mean a grandpa's guitars?

Skwisgaar: Grandpa's guitars. That's for pussies... and grandpa's. I think you know it.

me: i have a grandpa guitar.
my buddy: your a fucking pussy!
by gumballthechewy November 17, 2007
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A term used by a young person to a refer to an older person who they are close with or want to be close with. For a female the term Grandma BFF is appropriate.
I wish I could hang out with William Shatner. He would make an awesome Grandpa Bff.
by Nes88 September 8, 2009
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