After a male has ejaculated semen into a partners mouth, the partner follows through with taking a shot of extremely cold vodka, swishing both semen and vodka and then swallowing whole.
Examples for Russian Mouthwash / Russian Listerine.

Jacks partner took a shot of Russian Listerine, Jack replied with "It's dynamite against germs"

Kristina was feeling frisky, and wanted to show Andy how to properly do a Russian Mouthwash.

Kristina: "Andy, do you know what a Russian Mouthwash is?"

Andy: "Isn't that where you just use vodka as mouth wash?"

Kristina: "Yes... But let me show you how to do real Russian Mouthwash"
by Maximus Penetratus February 8, 2014
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A glorified blowjob where the individual performs the act while, just after using mouthwash.
(A)"I heard you got head yesterday." (B) "Even better, she gave me a Peninsula Mouthwash." (A) "You lucky motherfucker."
by garythechair August 7, 2018
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Lagoon Mouthwash-
When one person receiving oral, pisses down the throat of the person giving, and that person precedes to vomit up the piss onto the receiving person’s penis.
Person 1: It’s been a while since I’ve gotten Lagoon Mouthwashed.

Person 2: What’s that?
Person 1: Oh, oh buddy..
by Tangerinebee March 13, 2020
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A male peeing into a female’s mouth.
My husband gave me the ol’ Mongolian Mouthwash now I’m pregnant with Martians. Elon Musk help me!
by Wayne0keefe April 5, 2021
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a sweet concoction of colgate, piss, milk, and lemon juice.

commonly made in the swamps of vietnam with whichever supplies is affordable (toothpaste is optional but colgate is the only acceptable form)

many describe it as a sweet, creamy, and tart drink.
"Im gonna make some Mudman Mouthwash in my tree tonight."
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A lean-like drink that makes you really high

Ingredients:
Colgate
Piss
Milk
Lemon juice
me and the homies gonna drink some mudman mouthwash
by Jjjjjwi March 8, 2022
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To drink or consume, typically a full glass, or as much as one can handle, of mouthwash. Similar to: cinnamon challenge.
How is it even possible for "the mouthwash challenge" to be popular on twitter?
by Corny Marcus January 17, 2017
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