Grave turning 

Grave turning is a new extreme sport which involves the participant rapidly revolving their own corpse at such a high speed that they drill into the earth generating their own grave, which they then proceed to turn in.

Upon hearing that the laws of thermodynamics had been broken, Professor Mechler died of rapid-onset self induced bladder failure and was forced deep into the earth’s core by rapidly grave turning his own cadaver.

Grave turning by Dividius October 24, 2006

Turning In His Grave 

A metaphor used to describe a dead person, meaning they would be very angry or upset about something (if they were alive)

“You did something so bad under his name, I bet Michael Jackson is turning in his grave”

“I’ll smack you so hard, your dad will start turning in his grave.”

Turning In His Grave by Faxintrax May 27, 2020