After participating in a sexual act with someone of the opposite sex, wait until he/she gets up to go to the bathroom. Very carefully fold the sheet from where he/she is laying and crap on the sheet. Take a spreading utensil and spread the dookie all over the sheet, and place it back how it was originally before he/she returns. They lift the sheet and get in, and pull the sheet of dookie over them.
"I got up after having sex with my husband last night, and when I returned and got in bed... he totally pulled a dookie sheet. He got me good."

"My Girlfriend and I had sex, and when I came back from the bathroom she dookie sheeted me. I got angry, then she reminded me that it was April fools day...and we've been married ever since!"
by A rich, rich man January 21, 2006
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