Afterbum
When you sit on a seat someone else has been sitting on recently, and it's still warm. Also known as seat heat. (Ew!)
Bill: Why aren't you sitting down?
Joe: The seat is still warm - I think someone sat here before me...
Bill: Ew, gross, I wouldn't sit on a chair with afterbum...
Joe: The seat is still warm - I think someone sat here before me...
Bill: Ew, gross, I wouldn't sit on a chair with afterbum...
Afterbum
The warmth you feel on the toilet seat after someone else used it.
The afterbum was a nice surprise on a cold morning.