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is undefined

the description of a word that has not been defined in the by urban dictionary viewers.
by James T. Carson April 22, 2006
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Sans Undertale

An Epic Gamer. Plays mercy in overwatch. Easiest enemy
by Sand the gamer December 7, 2018
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Under 21 Tax

The difference between the amount of money given to an over 21 year old person by an under 21 year old person to buy alcohol and the actual cost of the alcohol, kept by the over 21 year old person as a payment for the service.
Under-age person: Hey, this bottle cost $17 and I gave you $20 - where's my change?
Over-age person: Sorry... Under 21 Tax.
by jonukas May 18, 2007
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undertale

An adventure RPG made by indie developer Toby Fox. It has a diverse and engaging storyline that has many paths to follow, and many endings as a result.
Hey, you should try genocide for your first play on undertale!
Nah man, fuck that. Pacifist has a better ending you dickwad.
by ArmedDolphin January 1, 2016
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undernerd

an individual whose technical (usu. computer-based) competencies are notably less advanced than those of his or her peers; a nerd wannabe
The project manager thinks I'm an experienced computer programmer but I'm really just an undernerd learning everything on-the-fly.
by Scott Fairbairn July 29, 2008
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undrunkable

the inability to feel drunk during a day/night while drinking heavily. Usually occurs the night following a hangover.

Many have tried to fight this condition by keeping on drinking despite the lack of effect, this usually results in getting sick before feeling drunk.
The irreversibility of this condition has been disputed as some claim to have succeeded in eventually getting drunk.
tom: dude, last night was really lame
mike: really? i heard everybody say it was a sick party!
tom: well, maybe it was, but i was undrunkable..probably from drinking so much the night before...anyway, i gave up after a couple hours and just went home
by yeahprobably June 17, 2010
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Undercover player

A male who claims to not be a player but actualy is.

A male who pretends to be a girls friend but really just wants to sleep with them.
He usually uses his angst over a recent breakup to lure unsuspecting females.
Person 1: I just realized he's an undercover player.

Person 2: how?

Person 1: He is still with one girl but is also trying to get with those two other girls.
by El cucuy707 May 27, 2009
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