stinky seconds 

Using a toilet or lavatory immediately after someone has completed making a bowel movement. The second person must then suffer the stench left by the previous tenet.

Bill beat me to the bathroom, so I had to take stinky seconds.

stinky seconds by Miyako December 30, 2008

sticky seconds 

Referring to when a guy has sex with a woman, following another man have sex/ejaculating in her

James and bill decided to share a girl, bill had her first, and James went after, as he liked his sticky seconds.

sticky seconds by ulsterphil August 17, 2015

second hand stink 

Going into a bathroom after someone takes a nasty dump.

I hope no one blames me for a "second hand stink" I just took a piss.

second hand stink by Speedway13 January 31, 2018