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Smart man's liquid nitrogen

Smart man's liquid nitrogen is dry ice mixed with 1,1-Difluoroethane. The boiling point of 1,1-difluoroethane is -11.29°F (-24.05°C) while it's melting point is -178.6°F (-117°C). The sublimation point (the point at which a substance sublimes, or goes from a solid directly to a gas) of dry ice (solid carbon dioxide) is -109.2°F (-78.46°C). Smart man's liquid nitrogen stays at around -78°C as long as you keep supplying more dry ice. Then the dry ice runs out and it heats up until it reaches -25°C where it becomes homeless man's liquid nitrogen. Then the 1,1-Difluroethane (can be found in computer duster) slowly boils away until it becomes gaseous 1,1-Difluoroethane. You can keep chemical reactions cool with smart man's liquid nitrogen and once it becomes homeless man's liquid nitrogen, you can use a funnel and a plastic soda bottle to store the liquid difluoroethane under pressure and label it and put it in the lab freezer.
I kept my chemical reaction extra cool with smart man's liquid nitrogen.
by HawaiianPunch1 September 3, 2023
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Smart Patrol

One or more individuals who REALLY control Urban Dictionary. Possessing special powers of judgement above and beyond those delegated to UD "editors."
Someone upstairs didn't like my Urban Dictionary submission.
The SMART PATROL <<CANCELLED>> my definition before it was even reviewed by UD editors !?! ........... NO SHIT !!

I'm SO misillusioned and rejectified !!
by Chengo Bolemongo October 5, 2006
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smart cookie

An individual who has impressed another person by completing or performing some kind of action, and in turn, are complimented.
"Bill, you are one smart cookie for finding a way to get that booger off your shirt without touching it" said Ted.
by madham January 12, 2009
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smart dumb nigga

That guy who doesn't know what he's talking about but tries to sound like he does. Not very bright, doesn't make any sense (though he thinks he's really profound, on to something, etc.). He's not lying to you, he simply doesn't know any better, but will insist he's right, which makes him not worth the trouble of setting straight. Yes, THAT guy.

A very on-point term (coined by comedian Katt Williams in The Pimp Chronicles pt 1), because we all know one...or more.
Examples of smart dumb niggas would be:
-the chick who insists her Infiniti Q45 is front wheel drive when it's really rear drive
-the guy who spells the word "ludicrous" like the name of the rapper Ludacris
-most people who say overstand or conversate
-one who knows the Bible like the palm of his hand but argues the Earth is only 6000 years old
-most conspiracy theorists

You know a smart dumb nigga when you see one basically.
by Kuahmel December 26, 2009
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smart alec

A nicer way to say smart ass. You can use this in an office or when kids are around instead of saying smart ass or if you are a stick in the mud and don't cuss.
Adam was being a smart alec so I didn't give him a cookie
by PTM October 25, 2006
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Smart-Allick

Refers to a person who is irritating because they behave as if they know everything. Originated in Wales, England throught the late 1400s.

Synonyms: Smart-arse, smart-aleck, smarty-pants
Jonathan: What's up Michael?
Michael: The sky!

Jonathan: Oh you smart-allick!
by JonathanGrahm September 17, 2017
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smart jock

an individual who is somewhat obsessed with sports, but does not beat up the small kids. That would be one of the differences between jock and smart jock.
an individual who gets straight A's to secure his athletic scholarship to college.

an individual who plans to make sports his life's work, but has a back-up plan, like Personal Training, in case he gets a career-ending injury.

an individual who still uses phrases like "ripped" and "hey man, what's up?" but will associate with anyone, not just jocks and cheerleaders.

an individual who recognizes that the smart kids have something to offer: like tutoring in a subject the smart jock may find difficult. In exchange for tutoring, the smart jock will often train the tutor to be big and strong like he is.
"Wow! You guys are really smart! I can't believe you got 90 in Physics!"
"I told you dude; we're not just jocks; we're smart jocks!"

"I plan to take Sports Management in College, just in case I get a career-ending injury. I love my sport and I want to be a part of it, even when I can't play anymore."

"I never thought you would associate with a skinny runt like me."
"Hey, don't put yourself down dude! In case you didn't notice, I didn't refer to you as a skinny runt, did I?"

"Why would a cool jock like you hang out with a skinny runt like me anyway?"
"I told you not to put yourself down man! I knew that you could help me get my Physics mark up so that I don't lose my athletic scholarship! In exchange for tutoring, I'll help you get big and ripped like I am!"
by Sean Dupuis July 8, 2006
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