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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The university in Santa Barbara, California, better known as UCSB. Due to the concerns of parents who do not want their children exposed to casual sex and beer, the UC Board of Regents changed the school's name to the University of California, Santa Barbara.
"My buddy balled six chicks this weekend. He goes to the University of Casual Sex and Beer."
by Szyslak February 13, 2005
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n. the act of having accidental butt sex; casual, no formal wear required.
As I was having sex with her, I accidentally performed casual butt sex. It was awesome.
by The Casual One October 22, 2013
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