Mattresscide 

Aiming your ejaculate at the mattress instead of releasing it inside of a female, thus risking impregnating said female.

Lebron James' father should have performed mattresscide instead of bringing that useless human into the world.

Mattresscide by BLKJAK June 16, 2011

mattrecide 

To kill a person while on a mattress,i.e. in bed.

Damn, that girl/guy is cute. I'd love to take him/her home and commit mattrecide.

mattrecide by jahnauasca February 22, 2008

MattressCereal 

All of the dead skin flakes, dirt, dust mites, and everything else that accumulates inside a mattress over the years.

I have to get a new mattress! Mine is full of mattresscereal.

MattressCereal by Lemonheadlice July 21, 2010

Mattressidal 

When you are so tired or aroused, that you are practically dying to get into bed.

While texting late at night with his girlfriend, he became seriously mattressidal.

Mattressidal by Bryce Morganthau April 4, 2023