A usually brightly-colored T-shirt that features a science- or comic book-related graphic. Usually worn over a thermal of a contrasting color for a complete look.

Named for the "Big Bang Theory" character who often wears such shirts.
"I got a Sheldon shirt for Christmas. It's blue and has Rock Paper Scissors Lizard Spock on it."
by Moon Unit Nimoy January 13, 2010
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Sheldon Cooper is one of the main characters of the TV-show The Big Bang Theory. He is extremely intelligent, but due to what appears to be Asperger's Syndrome, he is incapable of understanding other people and sarcasm. That said, he is probably the most hilarious character on TV right now. Although he would probalby look upon the tomfoolery of the show with haughty derision.
Leonard: How was Nebraska?
Penny: Oh, better than North Dakota.
pause
Penny: Guess that joke's only funny in Nebraska.
Sheldon Cooper: With the data at hand, you really can't draw that conclusion. All you can say with absolute certainty is that joke is not funny here.
by IQ 158 April 25, 2011
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Only word in their vocabulary is um
“What we doing today dr sheldon”
Um
by Drsheldonmyg September 22, 2019
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Full name of Mr. Krabs' nemesis Plankton on "Spongebob Squarepants" who works at the Chum Bucket. He frequently tries to steal the Krabby Patty secret formula, but also frequently fails. The closest he got to the recipe was the recently new epsiode entitled, "Plankton's Army" (Where his full name was also revealed).
Haha! Sheldon Plankton! What a funny name...
by Mister E. February 15, 2004
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A legal or binding agreement that describes a relationship between two or more entities, that takes into account every possible scenario or outcome, is extremely defined, articulate, diverse and all-encompassing, and provides clear consequences as a result of deviations from generally accepted guidelines, rules or methodologies.
Adam signed the Sheldon agreement, without reading the 200 page document, needed to buy a telephone.
by GMASS October 17, 2012
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The action of leaving your significant other after children with them and using them to get ahead in life. Sheldon Special also cn be used to describe a deadbeat father who resfuses to pay Child Support. See Sheldorado
Aunrey was a real bitch because she left me for a threesome so I gave her the Sheldon Special.
by Sheldorado July 3, 2019
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