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Common Sense Theorem 

A mathematical and scientific hypothesis that proves any statement true using only the words "Common Sense".
"Given- Equilateral Triangle ABC has an area of 5 a height of 5, and a side length of x.

Prove- Triangle ABC has a perimeter of 3.

Step 1- Perimeter = 3
Reason- Common Sense Theorem"

While the above statement is impossible, the common sense proves it true.

Common Sense 

Essentially, common sense is seen as knowledge that most people (except babies and the mentally disabled) should know. This can apply to things affecting all humans, or it can pertain to certain peoples and issues. When someone does something that contradicts common sense, you tend to think, "Dude you are so stupid. Anyone with common sense would have avoided that."
Things that universally defy common sense:
-trying to breathe underwater
-staring into the sun to try to see it
-trying to touch a rainbow
-believing politicians truly care about the people
-telling someone with a bazooka to fuck off
-driving on the wrong side of the freeway
-being a hypocrite
-poking any dangerous creature

common street trash

People who do not care about education and think a GED and working at Taco Bell is just fine. They typically do not wear current trends (often hoop earrings, flat to your head pony tails, K-mart camisoles for regular shirts, stupid over sized shoes, belly showing etc). They have babies at 15 and feed off the government. They get mad when people don't cater to their needs and often get in cat fights about their baby daddies.
Did you hear about Sandy? She's having her third kid. Common street trash.
common street trash by BSGirl March 2, 2010

Common Sense Guru 

An individual who has gained a large following among members of the American Tea Party and/or other quasi-politcal groups. This person is easy to identify due to their constant facial scowl and constant litany of opinions and insults against any people who do not agree with him. This is his/her way of making sure their followers do not start thinking too much...after all it is the Common Sense Guru's job to do the thinking. Sometimes, however, this is problematic, due to the Guru's exclusive reliance on the "common sense", which is unfortunately both uncommon and subjective.
Typical words of a Common Sense Guru:

"We the people need better jobs but we don't want anyone else to have better jobs...'cause we have common sense and they don't"

"Let's stop paying teachers so much...that money needs to go to a better place, like the pocket of your Common Sense Guru"

Common Sense 

Something so rare it's a god damned super power.
Deadpool: Shhh...My common sense is tingling
Common Sense by shatteredsteel November 16, 2009

Someone with common sense 

Someone who is NOT anti-vaxx, flat earther, a chemtrail believer, thinks that space is fake, thinks that the moon landing is fake or someone that thinks Australia is fake
OMFG LMfAO YOU ARE SOMEONE WITH COMMON SENSE LIKE ME THANK GOD!