dirty bed

Commonly referred to when an over weight male has a weak boner and is then sat on by his fat wife in bed. This causes him to take a giant shit from the excitement, resulting in a duo of snow angle activity in the pile of excess body fluids.

I was in the middle of a porn video, when my grandmother called me asking if i could wipe her ass cause she's so fat she can't reach around. My wife Judy jumped on my 2 inch junk, causing an instant dirty bed.