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An Upshart is the unfortunate act of lightly vomiting in one's mouth. Since the contents never actually leave the mouth, the Upsharter is left with the unpleasant task of re-swallowing the vomit.

What's the Upshart of this word in your vocabulary? It's much more fun to say 'I Upsharted,' than 'I Verped,' and you all know that "I just threw up in my mouth a little bit" is really only funny if you're still stuck in 2004. The primary difference between Upsharting and Sharting is the taste.
Paulie: "Damn... That was gross."
Kevin: "What happened?"
Paulie: "I just upsharted some ramen salad."
Kevin: "That is gross... that shit was bad the first time around."
Upshart by Sideburnes May 12, 2011
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upstart knockoff 

The upstart knockoff effect is when a character appears that closely resembles a pre-existing character. When this happens, the previous character appears less important.

Definition source: The anime Needless - Episode 5.
Come on then if you think you can take me on, you upstart knockoff
v. The act of looking up someone's shorts through the pant leg openings.

adj. Pictures or videos taken of the unsuspecting individual's underwear or genitals.

This term is usually applied to males wearing loose fitting or baggy shorts; when the individual sits down his shorts will leave a large opening usually under the leg.
v. I like to sit across from the boys so I can upshort them when they're not looking.

adj. I bring my camera to basketball games so I can take upshort photos of the guys on the bench.
upshort by Dexaw March 9, 2009
an event, undertaking, or item that seems promising but turns out to be nothing like what you imagined.
Our relationship was an upstart, she seemed really great at the beginning but it turned out she was boring and lame.
upstart by finnegan October 24, 2005
UpStart (uhp-stahrt) n. 1. A company or organization with innovative approaches to energy use, carbon pollution, resource consumption, and/or social equity, 2. A company or organization overcoming market barriers to build the new clean energy economy.

Coined by Lisbeth Kaufman as the title of a column on Climate Progress.
“UpStarts” are companies that are shaking up the market, breaking down barriers and helping change the economy.
UpStart by UpStarter November 17, 2011

Unsharted Territory 

State in which both underwear and the surrounding area are clean.
I didn't mind going down on him because I knew I was in unsharted territory.
John was such an upstart at the protest.
upstart by Caitlin Carlisle June 5, 2005