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grandfatherphobia 

Being scared of grandfathers.
He hates my grandfather! That must be his grandfatherphobia kickin' in!

Mowing My Grandfather's Lawn 

1) Trimming the gray hair out of your pubic hair.

2) Landscaping your pubic region, focusing on off colored hair.
"What are you doing tonight?"

"Probably gonna be Mowing My Grandfather's Lawn, it's getting pretty thick."

grandfather 

To give someone or something a special, status or privilege for something done before the new arrangements are made
I will not grandfather one religious leader for his deeds as a child.

The Ole Grandfather Cock 

sex move used by a male to pleasure two females at the same time. have the two females face away from you, one in the front and one in the back. place a strap on dildo backwards so that it is facing the girl behind you and also erect the penis towards the front girl. then rock from back to forward once every second.
when one finds themselves in the middle of a threesome and out of ideas, it would be wise to wip out The Ole Grandfather Cock.

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...

teach your grandfather to fuck 

to try to teach somebody something that he knows far better than you.
He knows how to write good English. And that is too far better that you. Do not teach your grandfather to fuck.