The last Friday before Christmas.

Should Christmas perchance fall on a Saturday, then Mad Friday will fall precisely one week before Christmas Eve.

Urban tradition dictates that the erstwhile person will inbible copious amounts of alcohol and fornicate (preferably in pub / nightclub toilets).

Mad Friday has, by Leeds City Council, in a futile attempt to attain Political Correctness, been renamed Feel Good Friday.

Footnote: Also known as 'Black Friday' in the barbarian lands of Scotland.

1st person: If I may trouble you, Sir, may I kindly enquire as to whether you will be attending the organ recital this Friday before Chrstmas?
Rudeboy: What gwan there Gangsta? 'Tis Mad Friday! Me gonna be wi me Red Stripe and rassing some gyal in da toilets! Bumbaclaat!
by Leeds Dr Rudeboy November 21, 2010
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The last Friday before Christmas. Everyone typically finishes work early, goes out and gets completely plastered. Roll on the 21st!
Keith: "You out tonight, mate?"
Mark: "Why would I be?"
Keith: "It's mad Friday!! Lets get, lets get, lets get fuckin' mental!"
by Sarahmuchhh December 13, 2007
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