Top definition
The only day of the week where fucking your friends is totally acceptable.

(There's also: Molest A Friend Monday, Touch A Friend Tuesday, Get Whipped Wednesday, Tap a Tit Thursday, and Get Slapped Saturday.)
Your friend (on saturday):"Did you and Sam fuck yesterday?"

You: "Yeah, I don't like him, but it WAS fuck a friend friday."
by FTWb1+cH December 15, 2011
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