The grandfather clock is performed while suspended in the air, generally with the help of 2 others. It is when you are hovering above a sleeping persons face with your dick and/or balls hanging directly over their face, waking them with either a slap or a loud noise (preferably similar to a grandfather clock striking the hour).
Dude, Robb ba ba brain'd me, so I'm gonna get him back tonight with a grandfather clock.
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When you are down to your “reserve” pair underwear or boxer shorts that have a hole in the bottom exposing your dick hanging down simulation a working grandfather clock.
When I was wearing my old boxer shorts I walked out in front of my girlfriend and she said nice grandfather clock.
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A total upset. One of the biggest surprises you've seen in a long time. Like discovering Ma'am and George had a secret passage to upstairs for Webster, hidden away inside a faux grandfather clock.
"Wait a second. So you're telling me Ivy is a dude???"
"I slid off her pants and...fuck. I think I'm going to be sick again."
"She didn't have a bulge or anything?"
"Nope. Like a fucking stairway in a grandfather clock...ugh...I'm going to hurl again."
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Where one's testicles hang so low that they swing between its owner's two legs like the pendulum of a grandfather clock.
Scott: how come we never go to the pool dude?
Jose: I have Grandfather Clock Syndrome
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A giant public version of that time-telling thing you put on your watch. Side Note: Five times out of ten, it is safe to assume that said grandfather clock that you see probably wasn't your grandfathers.
Why do Grandfather Clocks even exist?
A Diddy, a Dance Move. Promotes Style, Character, Energy
Shut your Mouth, did Giirth just do Dat thing? Yes Siree, The Grandfather Clock Jig is his Wheelhouse Move, recognize yo!