Top definition
the day of the week when you get blackout drunk and have sex with random strangers because you cant get pregnant.

please note: this does not make anyone a slut, cause when you cant remember it, it doesnt count!
Q-what are you doing tonight?
A-it casual sex friday what do you think
by founderofcasualsexfridays October 21, 2010
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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2
casual sex had at the start of the weekend that doesn't involve any dressing up or fancy meals.
"God, my workplace is adopting that casual fridays thing. I'm going to have to see my boss in JEANS."

"Really? Let's go to a pub afterwards and get us some casual sex fridays."
by Tcakes February 21, 2010
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