DGAF Friday is the last day of a week in which participants refuse to care about anything, simply not giving a fuck. Also can be renamed DGAF Monday, Tuesday, etc. as long as it corresponds to the last day of a work/school week before the weekend. If people DGAF all the time then things get out of hand, so there is now a designated day.

this term was coined in November 2009 by Keenan Turner and Zach Mastro
So far I have failed an exam, recieved 2 detentions, and pissed all over a toilet seat. But i dont mind, im just celebrating DGAF Friday!
by sewfertanick December 1, 2009
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The single greatest day known to man. Period.
Mr Lynch was wearing some solid cargo shorts on DGAF Friday.
by veed October 15, 2007
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