back extension

A butt that, is very flat and resembles a long back leading up to the legs.

Damn she'd be a 10 if it wasn't for that back extension.

by the watch April 13, 2015

Back spunk

When a man cums inside a woman's rectal passage and she then farts the spunk back out onto the man

My girlfriend had bad flatulence the other day...after I butt fucked her she back spunked me

by S3xxyTeets January 4, 2019

Splash back

When you take a heavy shit, and the water splashes back up, soaking your butthole. Usually in reference to an overused port-o-jon.
AKA stank water wash, mud cleanse, poor man's bidet.

There's nothing worse that dropping a duce in a port-o-jon that hasn't been pumped out in weeks, and getting a splash back.

by Hobby-less October 20, 2017

back photo

When on social networking sites 'back photo' is the act of clicking on the 1st Photo and then when viewing the photos, instead of going forwards, you go backwards. Mainly this is done to reveal people's embarrassing hair styles and choice of attire.

This Fit guy just added me, I hope he doesn't Back Photo Me

by adzbeadz October 24, 2011

Back-sperm

Back-sperm is the last place finisher of the sperm race.

Fucking hell, if you're the winner, I dread to think what your back-sperm is like!

by Joshdex March 19, 2017

phat back

A fat bum

Ngl you have a phat back

by DJkimble May 26, 2018

back squirt

an audible and explosive shit

guy 1- “I beat my record longest back squirt after taco bell last night!”
guy 2- “awesome! i beat mine last week!”

by To it April 24, 2020