When A man fills his partners ass with whipped cream and other ice cream toppings, then then has them shit it into their mouth.
Last night I found some left over whipped cream and totally had myself a Dirty Sunday.
by ski&biker November 9, 2011
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The second Sunday in October- a rastafarian holiday of debauchery
by fidgety2 October 15, 2016
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On “Not To Dirty Sunday” you are allowed to get dirty but not to dirty. Like some blowies and handies are perfectly fine but no hardcore anal and pounding your mates asshole so hard it makes a loud clapping noise.
Edward: Let’s do extremely hardcore anal

Professor Surge: Don’t be silly it’s “Not To Dirty Sunday” , which means we may not prohibit the rules of doing hardcore anal. The rules say we could do some blowies and handies Edward.
by negro500 November 10, 2019
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Dirty dozen Sunday is when you and your buddies each lock themselves into a room and beat off 12 times before leaving the room. Common side effects are extreme highs, extreme lows, apathy, excitement, shooting blanks, hatred of women, and of course, extreme chaffing. Most commonly done by frat boys, porn addicts, professors, businessmen, Chinese people and nerds.
Dude 1 to Chick 1: We're organizing a Dirty dozen sunday, you want in?
Chick 1 to Dude 1: I hate you guys.

..Later...
Dude 1 to Chick 1: Sorry, I can't sleep with you for at least 2 weeks, I rubbed my penis raw yesterday.
Chick 1 to Dude 1: I hate you guys.
by Ejaculaxor March 12, 2008
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