Udderslide 

It means a stinky fart

Damm your Udderslide stinks

Udderslide by aryats0305 November 21, 2016

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

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

undersided voter 

Someone who has zero doubt who they'll vote for, and says "Well, gosh, I can't really decide at this point."

Skewing the polls, giving the country a false image of its future, she characterized herself as an undersided voter.

undersided voter by Monkey's Dad August 24, 2020