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sloppy backwash 

frenching after blowing a load in your girl's mouth.
I came in my girl's mouth and she asked me to sloppy backwash her, but I said HELLLL NOOO!!
sloppy backwash by Not kinky November 3, 2007

Vaginal Backwash 

A beverage made by an Australian company in in the early 30s, has the abbreviation VB or in full Vaginal Backwash.
Jimmy - Last night we did some fucking sick skids in the trusty old v6 Au Falcon, then we got hammered at the local.

Jimbo - Sweet as man, you look super hammered, what were you drinking ya coon.

Jimmy - Some crisp cold Vaginal Backwash with lemonade.

Jimbo - You little bitch, thats a shandy. You should be drinking straight VBs pussy. You must really drive a holden commo shitbox
Vaginal Backwash by Ray Grimon February 26, 2019

Toilet backwash 

n. when you're taking a huge dump and some of the liquid in the toilet splashes back up onto your ass
Dude, that burrito I ate came back to haunt me, there was toilet backwash everywhere. On my ass, in my ass, in came out of the toilet and onto the ground.
Toilet backwash by Jalapeno64 January 17, 2009

backwash 

Backwash is often created inadvertently or unintentionally when liquid escapes the mouth during the process of drinking, though it can also be created intentionally by an act of spitting or purposely letting liquid fall from one's mouth and back into the container.

When multiple people drink from the same container, there will usually be some amount of backwash put back into the container; as the number of sips increases, in general, the concentration of backwash also increases.
"Dude, I don't want your backwash." (This person has perhaps declined someone's offer of their nearly empty can of Coke).
backwash by Hari____ April 27, 2006

Nebraska Backwash

The act of Oral sex. When the girl from the decent of a redneck gets tired of her breath smelling like hick that she uses some listerine. She then gives another redneck great oral sex. The man ejaculates into her mouth, she spits everything into a cup, and the man then drinks it.
Fuck man, no more Nebraska Backwash for me. That shit taste horrible.
Nebraska Backwash by littleboi_ February 17, 2013

The last 10% is 90% backwash 

A phrase conveying the idea that the last 10% of a drink is comprised of 90% backwash.
Bro 1: Dude, you can't leave a wounded soldier on the table.
Bro 2: No bra, The last 10% is 90% backwash anyway. There's basically no beer in there.