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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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