Hit the Coffin 

A phrase equal to the saying "hit the sack" meaning go to bed. Used among Gothics and vampire enthusiasts (not to be confused with twihards)

I'm exhausted it's so late

yeah I think I'm going to "Hit the Coffin"

Me too, good evening

^,,^

Hit the Coffin by Ava Pendragon June 14, 2011

Hit The Nail On The Coffin 

A Malaphor, or an idiom blend, combining "hit the nail on the head" (to do something exactly right) and "another nail in the coffin"(something that will harm or destroy someone – e.g., cigarette) to mean someone succeeded at doing something that may lead to their demise or the demise of another or just that they did a great job at something that they probably shouldn't have done at all.

Best used sarcastically.

"You did a great job of pissing off your ex. Really hit the nail on the coffin back there."
"What?"

Hit The Nail On The Coffin by nmwhitehead September 3, 2016