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just a theory 

A phrase often used by science deniers, usually against the scientific theory of evolution. It implies that a "theory" is just an unproven "guess", therefore evolution is an unproved lie. This stems from a fundamental misunderstanding of the word "theory" in the context of science.

In colloquial use, a 'theory' may mean a "guess", but in Science, a 'theory' is defined as "a well-substantiated explanation of an aspect of the natural world." Therefore the phrase "Evolution is just a theory" makes no sense.
A: Evolution is just a theory!
B: Yes, it is. It's a scientific theory that is supported by the best available evidence. Cell theory is a theory too, do you deny that we are made of cells? And gravity is a theory too, do you jump off of bridges?
just a theory by ben-mactavish August 16, 2022
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just a theory 

A pathetic tactic employed by creationists who strive at reminding us the obvious.
Evolutionary biologist: "Observation indicates that we evolved from lower organisms..."

Creationist: "This is just a theory."

Evolutionary biologist: "Of course it's just a theory. Am I expected to be omniscient?"
just a theory by Arjer September 21, 2007

but that's just a theory 

...A Game Theory! Thanks for watching!
Consider your childhood ruined, and remember...
But that's just a theory! A Game Theory! Thanks for watching!

that's just a theory

Personally I think Ness is Sans.
But hey, that's just a theory, a game theory!

But Hey That's Just A Theory 

But Hey That's Just A Theory

But that's just a theory, a Game Theory! 

Most commonly used by MatPat, owner of the Game, Food, Film and Style Theory channels.

Used at the end of videos to remind people that he is just making theories and might not correct.
*MatPat finishes talking about his Theory* But that's just a theory, a Game Theory!
More from Urban Dictionary

Frothability 

The measure of an emotional and over zealous consumer in an upwardly charging market, also known as a bull market. It's characterized by rising asset prices, increased investor confidence, and favorable growth in the markets, bro.
The frothability was evident as over-zealous consumers eagerly engaged in bidding wars, driving property prices to unsustainable levels reminiscent of previous speculative bubbles.
Frothability by cptn.kagaroo1 January 26, 2024
Word of the Day on November 12, 2026

Soul digger

A man who dates women with the sole purpose of exploiting their time, energy, and labor while he sucks the joy and happiness from their lives.
"That guy's a soul digger. He'll expect you to work full time, but you'll be doing all the cooking, cleaning, laundry, shopping, and childcare while he plays video games or watches TV."
Soul digger by anonymous November 11, 2026
Word of the Day on November 11, 2026

pod person 

A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.
pod person by Christopher M. May 9, 2005
Word of the Day on November 10, 2026
A dead drop is a location used to secretly pass items between two people, without requiring them to meet.

Spies have been known to use dead drops, using various techniques to hide the items and to signal that the drop has been made. Drug dealers use this as well.

A common place is to duct tape the item to the underside of a toilet cover in a public restroom.

A signal is sometimes used as well to indicate there is something to pickup, like a pile of stones in a certain formation. After checking the drop the signal is removed.
"The dead drop is the restroom toilet at the Gulf station at the corner of Commercial Ave. and Georges Rd."
dead drop by rubberroom July 23, 2008
Word of the Day on November 9, 2026

No Surprises Wedding

A "No Surprises Wedding," or NSW, is a wedding invitation designation that tells attendees that there can be no unplanned announcements, engagements, events or speeches at the wedding - all actions must be pre-approved by the couple. Anyone who performs an unapproved "surprise" will be asked to leave the wedding early.

This designation comes from Reddit, where so many stories of bad wedding behavior indicated a need to communicate expectations for the wedding behavior of attendees.
You are cordially invited to the nuptials of Brian and Tom on October 31 at noon.

Please note that this wedding is child-free (under 10) and a No Surprises Wedding (NSW). Reach out to wedding planner Sami Smith to request approvals or exceptions; please note that exceptions will be rare. Limited child care for under-10s will be available. All approvals will be noted and included in planning. Unapproved, or surprise exceptions, will result in guests being asked to leave.
Word of the Day on November 8, 2026
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