shum stain 

A Shum stain is a mixture of shit and cum in the form of a stain.

Girlfriend: what is this weird smelly stain babe

Her Mans: oh that’s a shum stain from a long forgotten night full of drinks and fun

shum stain by JustOneOfTheBoys November 6, 2019

Scumstain 

Graffiti : An unpleasant mess that could have been avoided if somebody had worn a condom

I am sorry to inform you, but you have Scumstains all the way round your back passage.

Scumstain by Viking Wookiee January 24, 2023