Underthot 

that one girl who acts nice but is an absolute thot

you're an underthot, you know that

Underthot by I'm not a bad slime slurp June 3, 2019

underthink 

Verb: to think or analyze inadequately
(third-person singular simple present 'underthinks'; present participle 'underthinking'; simple past and past participle 'underthought' – informal 'underthunk' ) \ antonym – 'overthink'

It's a trick question; don't underthink it.

underthink by ΔиłĦ☼иצ ߀₡ʞ November 19, 2010

underhopped 

is the condition that results from taking an unbalanced diet in which certain nutrients are lacking. Specific for this condition is the lack of hops in your daily food intake.
Depending on the amount of hops that is missing in your body this condition may result in normal body balance and muscle coordination, normal speech, normal behaviour and seriousness.

The World Health Organization cites malnutrition as the greatest single threat to the world's public health. Improving nutrition is widely regarded as the most effective form of aid.

The opposite is overhopped.

I feel underhopped. Please hand me a beer!

The party yesterday was dull. I've been severly underhopped.

underhopped by theMittler October 15, 2012

Underhook Slam 

A flawless sex position which involes the male putting wrestling underhooks onto his female partner, and then proceeds to thrust while pulling down with his arms,resulting in what women like to call heaven. The double action of arms and hips create the perfect combination. Although slightly rough it always results in an A+ grade for performance. (Can be preformed in muiltiple positions, standing, sitting, missionary, etc)

Holy shit, i got Underhook Slammed last night....I'm hooked

Underhook Slam by Wuldnt you like to know June 13, 2011

Double Underhook 

During missionary sex, when the women begins to move around too much, you place your arms underneath hers in a double underhook fashion to prevent her from sliding any further.

Dude, Mike was fuckin' this bitch and he was pokin' her so hard he had to double underhook her so she wouldnt move around so much.

Double Underhook by Three Six Zero's Best August 8, 2007

undertoad 

A bogeyman, or in general, fear and anxiety about the unknown and mortality. From "The World According to Garp".

Jet travel was his undertoad.

undertoad by Brillig January 24, 2004

Underhit 

Taking a hit of cocaine before then smoking weed, to counteract the inevitable sleepiness that comes with it

Dude I'm getting so tired, I need an underhit to keep me going

Underhit by Gareth Pontin August 6, 2019