Grandfather Cock

Stand naked in the corner of a room with arms extended like the hands of a clock while rocking hips side to side to slap one's balls against his thigh rhythmically with every second

Uncle Lester got drunk again on Thanksgiving and did the grandfather cock in the corner of the living room for hours until my mom finally called the police

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grandfather clock

While mooning someone, the mooner bends over exposing his dick and balls. He then sways back and fourth as to make his dick look like the long pendulum on a grandfather clock

It just started as a casual moon, but then turned into a grandfather clock

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Grandfather-Clock

When one gets on a table without your pants on, and swing your junk left to right.

I did a Grandfather-Clock to your mom

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grandfather cock

When you're trying to shop for some antique grandfather clocks for your paps but then you unfortunately forget the "l" in "grandfather clock" and now you wish you were dead.

Poor Fool: *mistakenly types 'grandfather cock', clicks on 'images'*
*questionable things appear*
Poor Fool: AH DEAR GOD GET THE BLEACH

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grandfather's watch

A party trick, whereby you fool the victim into looking at your penis stretched around your wrist. Usually done while drunk. Originated in Bloomsburg PA in the mid 1990's

Hey ladies, you wanna see my grandfather's watch? Hold on, lemme turn around and put it on real quick...

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Argentinian Grandfather

Awesome guy, he lives near Buenos Aires and speaks Spanish with a central European accent. His closet is full of brown suits. He used to be an electric repairman in the 40s. His favorite drink is Fanta and his name is "Heinz von Schrettenberg"

My Argentinian Grandfather from Buenos Aires just called and said that Fanta is the "superior beverage"

GrandFather Sauce

GrandFather Sauce Meaning: A man of the age 60 or older's diarrhea

Bob: Wholly shit it smells like GrandFather Sauce, Dave, Do something about it.