The Grandfather Clock 

When a male of over 65 years old swings his cock back and forth over a young woman's face until he cums. Which is almost always 12:00.

Hey did you hear he gave her the Grandfather Clock?
What time was it when he came?
12

The Grandfather Clock by BIG 80085 March 9, 2010

The Grandfather Clock Jig 

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!

The Grandfather Clock Jig by Bennie BoyTV June 15, 2019