The act of ejaculating all over a partner, trying to go for as much surface area as possible, then very quickly wrapping them from head-to-toe with a roll of toilet paper.
See also: The King Tut
Lisa: "Hey Susan, what are you up to tonight?"
Susan: "Mmmmmppphhh mmmmmph Cmmmmm mmmmmmmmyyyy!!!"
Lisa: "What's that you say? Brad gave you a Cummummy again?"