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1.
Something every living person should have, but yet Sorority Girls seem to have very little of.
Everyone knows that Mecca is the Islamic holy land, except for that Sorority Girl at work.
by Angered by a Co-Worker May 11, 2005
 
2.
Used to describe a girl who likes to sleep around. A girl who is a slut and has sex with everyone
Bob: Man.. i can't believe my girl cheated on me!
Sean: Don't worry man. That bitch is just common knowledge.
by Zackaroni February 02, 2010
 
3.
Information every human being should know. Coffee just after being on a burner is hot. Mississippi River flows south.
Everyone knows about the birds and the bees, its common knowledge
by Rego June 29, 2003
 
4.
when every knows that your fuckin' around
It's common knowledge that Grant got the lemonade special at the Williams'.
by knepski October 16, 2004