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mouthwash defense 

Used by probationers who aren't allowed to drink alcohol to explain why they fail breathalyzers. Similar to the toothpaste defense, the cough syrup defense, and the hand-sanitizer defense, the latter of which only applies to ETG tests (Urine alcohol tests).
Probation officer: You failed your breathalyzer.

Probationer: I didn't drink alcohol, I just used mouthwash before I came here.

Probation Officer: That's the mouthwash defense. It's bullshit and you know it. You're going to jail.
mouthwash defense by Lupara2012 August 1, 2012

Mouthwash Dick

When a man's penis tastes unpleasant so you supplement fellatio with mouthwash, resulting in much pain and discomfort for the partner.
Yo man. My girl was straight cravin my tangy dick after my workout. Bitch forgot to buy alcohol free scope and gave me mouthwash dick!! Shit burned for 20 minutes!!
Mouthwash Dick by Definitionman22 December 14, 2018

Mouthwash 

When a man cums and pisses in her mouth and she swirls it’s around like mouthwash before spitting it out on the floor or sink.
How’s that mouthwash tasting bitchhhhhhhhh!!
Mouthwash by Mouthwasher February 10, 2020

Mouthwash 

When you put a little water in your mouth for a few seconds, and dribble it over your partners junk.
We lost the lube. But we weren’t going to stop, so I gave her a mouthwash.

My girl was a bit ripe smelling down there, so I gave her a mouthwash before I went to town.

I wanted to suck my man off after his game, but was was a bit stanky, so I gave him a mouthwash.
Mouthwash by FuckeRhi September 4, 2020

Mayfair Mouthwash 

A cheap disgusting Vodka under $15 for a half gallon usually consumed by blistering Alcoholics.(Nikolai, Jacquinn's, Vladimir, Crown Russe)
At the stroke of 9am the hardcore alcoholics lined up outside of the liquor store demand their Mayfair Mouthwash in order to progress with their daily duties and cease their Delirium tremens.

Montana mouthwash 

The act of performing oral sex with your partner while your mouth is full of toothpaste.
Guy #1: It smells so clean in here!

Guy #2: It's because my girl had a Montana mouthwash this morning!
Montana mouthwash by UrbanJake December 17, 2015