The day of the week when both you and your sexual partner have off from work, usually Sunday. The whole day is spent having sex and, presumably, cumming. Thus, Cumday.
Friend: So, how was your weekend?
Girl: Cumday came twice this week! I didn't think he even had that much in him.

Guy: What are we doing this Sunday?
Girl: Don't you mean Cumday?
Guy: Yesssssssssssss

Girl1: You mean, you're into me?
Girl2: Uh duh. What gave it away? The 69 written next to your name in my phone?
Girl1: So... do you have off this Sunday?
Girl2: Cumday here we cum!
by alkenethiol July 12, 2014
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When you survive NNN you are cum free.

You are allowed to bust a nut immediately.
Cumday
Mike: how was your NNN?
Paul: i survived
Mike: Pull your fucking pants down and CUM ALREADY!
by cock469 January 14, 2021
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When you decide to ejaculate on a Chocolate Sunday and serve it to a naughty customer.
Dylan: That dude was sure an asshole, right?
Taylor: I know, I gave him a Chocolate Cumday.
Simultaneously: Nice!
by Escandalo! March 23, 2011
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when the male penis is erect he places chocolate syrup on it, in a spiral around the shaft. he then adds whipped cream on top of his penis, and a cherry on top of that. the idea is that since his penis is erect the structure will remain stable, until his designated partner divulges in the man-made dessert fun.
Jessica: "Oh man I'm really craving something sweet right now. Let's go get dessert!"
Greg: "You are in luck! It's Wednesday....you know what that means! Ice cream Cumday!!!!!!"
by klempy April 7, 2011
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