underside 

same thing as taint, gooch, etc.

it's the patch of skin between the balls and asshole. girls have one as well but it's not as funny.

it was so hot out my underwear was soaking up all the sweat from my underside.

underside by Feve July 25, 2011

Russian Underside 

the russian underside is when your lady gets on top of you upside down and backwards and masturbates you with a 400 pound salmon while you masturbate her with a snow fox.

"Natascha, I think we need to spice up our love life"
"Boris, if you go to the fish store and get some salmon, we can do the Russian Underside and things will be so much hotter!"

Russian Underside by milkmaid604 June 13, 2007

Scratching the underside 

To undertake action that is considered risky and taboo

A man returned from a drunken and chemically facilitated night out on the wrong side of the tracks. Another man, upon seeing our hero's return, quipped: "he's been scratching the underside".

Scratching the underside by Bakelite October 2, 2012

The French Underside Childmaker 

A sexual act in which a male picks a female up, shoves them into a ceiling fan, and proceeds to fuck them, wether if they are dead or not.

I just did The French Underside Childmaker to your mom!

The French Underside Childmaker by SirSnyder February 1, 2020

undersmile 

Euphemism for vagina. Coined by Joy in the TV comedy "My Name Is Earl".

Joy: "We gotta work backwards. Like when you rewound that videotape to see if Sharon Stone really flashed her undersmile."

With "flashed her undersmile", Joy is referring to the film Basic Instinct, specifically the scene where Catherine Tramell (Sharon Stone) distracts her interrogators by uncrossing her legs to reveal a lack of underwear.

undersmile by dee kay April 14, 2008

a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face 

The default picture used by over 84% of users of the popular networking site myspace (See definition #4).

-Man, she looks fine!
-Can't you tell? That's a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face, dude.

a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face by cchriss92 August 9, 2007

underslicer

When the urethral opening of male genitalia is elongated and extends down the head of the penis. due to this sick deformed abomination of a penis, any fluid secreted will simply drip down like a leaking faucet.

Carson: " dude what the fuck's wrong with your dick?"

Nick: "I thought everyone had one like this..."

Carson: "No you sick bastard! You have an underslicer!"

underslicer by anuscrab December 26, 2011