A Stainer 

This is when you finish masterbating or oral sex and the cum get all over ur bed sheets and clothes.

Dude! we accidently did a stainer all over my carpet!

A Stainer by SICK BILLY December 26, 2005

serious stainer 

After taking a shit you keep wiping but it just won’t go clean.

Bro, i was stuck in the stall for 20minutes, i had a serious stainer!

serious stainer by mommysmilk.xxxxx January 14, 2022

Drainer and stainer 

drainer and stainer:
Vulva and anus

‘dogs were sniffing around my drainer and stainer ...’ Courtesy of Kate McKinnon on SNL

Drainer and stainer by Bartledoo April 22, 2020

crusty stainer 

noun: a person who smells as if they had been bathing in a dark crusty substance, that may be feces and may not be.

I smelled something rank and immediately blamed it on the crusty stainer who was sitting next to me.

crusty stainer by Loganzo June 26, 2005

The stainer 

variation of the shocker where you put the index finger in the vagina and 3 fingers in her anus while stimulating the woman's clitoris with your thumb.

Damn that girl left shit on my knuckles after I gave her "the stainer".

The stainer by J. Jonah Jameson May 31, 2009

bowl stainer 

brown streaks left in the bowl after taking a crap

I peered into the stall and saw one of my coworkers bowl staining.

bowl stainer by brian meade February 20, 2004

poo stainer 

A person who exhibits bratty or obnoxious behavior, often for no legitimate reason. Can also be shortened to 'stainer.'

"Then he said, 'I don't have time to email you! Football is a 12-hour-a-day job!'"
"Eric is such a poo stainer."

poo stainer by HarryPi September 11, 2009