A sadist who creates impossible equations for experimenters to solve
Theoretical physicists are the one guy in the office who makes an impossible deadline for an impossible task.
by uselesstemporary September 21, 2014
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Old friends that you never really hear from anymore, apart from the occasional Text msg, Email or fleeting birthday card, that always contains one of the phrases: "we should meet up, hang out, do something, I'll call you..." but never actually make any arrangements. These are good on paper mates, those that bump up your personal sense of popularity but never actually see. Friends in theory.
"Are you kidding, Annie's not going to come, she's a Theoretical Friend..."
by KimberleyStrange February 6, 2006
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A person who is more concerned with his product or passion to worry about how to make money. First coined by Stephen Colbert to describe Brian Greene, a theoretical physicist, and his organization, World Science U.
Stephen: "Does this cost anything?"
Brian: "No it's free."
Stephen: "How does the university make its money? Off the football team?"
Brian: "That's a good question. I don't know, I don't think about those things. I just want to get good material out there to the world."
Stephen: "You're a theoretical physicist and a theoretical businessman!"
by bernhot February 19, 2014
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It is a general description or brief overview/summary of a subject obtained solely from one's left thumb.
Have you completed your "Theoretical Background" for your proposal yet?
by Th3OverWatch September 20, 2018
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When a chick looks good from far away or at a glance, but then the sad reality becomes clear that they are as ugly as the north-bound end of a south-bound horse when approached or when a better view is available. Also, cute in theory
Example 1
Dude: Bro, did you get a good look at that hottie that just passed us? I missed her.

Bro: Yeah dude, don't worry about it, shes only theoretically cute, nothin to worry about.

Example 2
Bro: Holy crap dude, you didn't tell me you had a sexy-ass neighbour!

Dude: Yeah cus she's just cute in theory
by Simian Infernus January 18, 2011
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A group of people who attempt to make sounds that resemble music.
Those guys think they are musicians, but they are just a bunch of Theoretical Hero's
by Theoretical Heroism May 19, 2010
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A Theoretical Virus is a fictional virus that is based on a real virus, but does not actually exist. They are used as a benchmark for viral preparedness. A good example of a theoretical virus is lyssa x, which is a relative of rabies. Web groups such as OZORT are geared toward preparing for worst case scenario viruses like these.
A Theoretical Virus can be just as dangerous as a real virus if you aren't prepared for it.
by Edward Stevens August 28, 2006
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