underPSI 

Under Pressure. typically meaning "under boost pressure"--automotive terms.
but mostly meaning "under pressure" to race, talk shit, or lay the smack down on that azz!!

underPSI by Anonymous September 23, 2003

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

underasian 

An smoking hot underage asian girl, jailbait so irresistible that it is all but guaranteed to land you in the slammer for some 'hard' time.

Bob - Did you hear about that party tonight at doug's place?

Rick - Yeah, there are supposed to be a bunch of underasians there..

underasian by eatsleepobey December 18, 2009

Underpits

Another word for armpits. A combination of underarms and armpits.

A word that makes me laugh.

Would you like to smell my underpits?

Underpits by Matilda o Donahue November 7, 2017

Undersit

Sit is the opposite of stand right?
If thats the case, Undersit is the opposite of understand.

Undersit: to misunderstand

If undersit just isnt good enough, then use something that is more of an opposite, like underlaydown or underdie.

I undersit why someone would want to put a rabid monkey in a washing machine

Undersit by maskas March 16, 2005

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

underpointing 

invented in Rye, England

The act of pointing at a person via an underarm swing. Widely percieved as the gayest form of pointing known to mankind.

Gary walked into the bar and saw Jamie. Excited at the the prospect of friends at the bar, Gary pointed in a manly fashion. Jamie leapt to his feet and began the act of underpointing. Gary left the bar.

underpointing by andychilly April 17, 2009