Back splat 

Poo that's been left on the back of the toilet after a dump. The shit stains left after a messy poo in the loo.

"I left a particularly messy back splat in the upstairs loo for the misses to clean."

"Who couldn't be bothered to clean the toilet after using it and left that nasty back splat?"

Back splat by lespoos June 29, 2010

Back Splat 

A term used to describe a large sweat patch that has formed on the back of a person's shirt/T-shirt.

Girl: "Man I'm so sweaty, do I have a Back Splat?"
Best Friend: "No no your fine..."

Back Splat by naomi.j October 18, 2008

Back splat 

A fictional event promoted by the Walla Walla wine industry. These so called professionals reference a ‘back splat’ event that involved a Montana-originated flood that crashed against a basalt ridges and caused a rush of water into the Walla Walla region.

Lynne meant to describe a bath tub effect of what happened in the floods from 12,000 years ago but her petite verdot consumption led her to describe a back splat, which coincidentally Britt left in the men’s room.

Back splat by clermontboy September 14, 2019

back-splatter

Noun. The high-velocity pattern made by liquid fecal matter on the back of the toilet above the waterline. This pattern is formed when one has an uncontrolled evacuation of the bowels as he or she is in the process of sitting down and is still in a leaning-forward position. Because the movement associated with this phenomenon is usually time-consuming, the resulting back-splatter typically dries and will not come off when the toilet if flushed. Back-splatter usually lasts until physically removed with a brush and Comet.

Man, I know Al has been in here today, there's already back-splatter on the toilet.

back-splatter by Duckmeat March 9, 2005

back-splatter

when someone pulls out after anal sex
and splatters semen on your backside.

He just gave me the most covered back-splatter ever!

back-splatter by Brandon S. April 15, 2006

back-splatter

The line of mud pasted onto ones back, after one has been riding a bike through said mud, thus producing the upward lift of said mud, from the circular motion of the wheels on said bike in motion.
Said word was created after observation of competative bikers training in the rain who stopped at a diner and all looked like skunks with their enormus examples of back-splatter in its perfect state.

"woah! those competative bikers who have been training in the rain have totally perfect back-splatter!"...."no doubt if they had been doing that naked they would resemble the negative images of skunks!"

back-splatter by gillians pseudonym May 13, 2005

Splatter Back Special 

The act of vigorously thrusting your shaft deep into a girl on her period, causing blood to splatter over your genitals and belly.

I gave Becky the ole splatter back special last night.

Splatter Back Special by SplatterKing October 26, 2013