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mouthwash 

A man's ejaculate in his partner's mouth
Jim expected me to gargle his mouthwash after I gave him a blow job yesterday, Sue told her friend Jennifer. I did it before swallowing, but I hope thee boys get more mature when we get to high school.
mouthwash by BRD May 4, 2005
"The Art of making someone cum by penetrating his nose while he is thinking of Mort from the Madagascar Movie"
Hey have you had an Mortgasm in the last few days?

If not you should try it out again.
Mortgasm by BigDGamesCEO April 5, 2022

buckshot mouthwash

to put a shotgun in your mouth and pull the trigger.
guy 1: hey did you see what happened on the news?
guy 2: yea that dude gave himself a buckshot mouthwash

memphis mouthwash 

The act of french kissing a girl while you have smokeless tobacco in your mouth.
In Joe Dirt, Joe kisses a girl while he has a dip in his mouth and says, "keep that skoal baby." That is memphis mouthwash.
memphis mouthwash by jd220905 April 8, 2008
an outburst caused by excitement over math problems.
"aaaaahahhhhahhhhhaaa! BONUS POINT!" said miss hitcho
"she's having a mathgasm again" said student
Mathgasm by Man Chow March 27, 2008

Kensington Mouthwash 

The Curb Stomp maneuver made famous by the film American History X has it's origins in the city of Philadelphia. Known as the "Kensington Mouthwash" it has become the favorite means of dispatching ones foe in the predominantly ghetto neighborhood of Kensington. The Kenzo maneuver has been adopted by the city as a whole, mostly as a joke which shows you what kind of people they really are.

The Kensington Mouthwash requires you to somehow get your opponent onto the ground. Then you force them to open their mouth and bite down on the curb. From there, you apply the proper amount of force onto the back of their head in order to kill the person, preferably with a swift an decisive stomp or kick.
Timmy, get your fucking hands off my cheesesteak or I'm going to take you outside and give you a Kensington Mouthwash.