When you're spooning with your boo and you accidentally pass wind. This usually happens when the partner's knees are tucked up tight to yours and your body is in already in the full bowel movement position. You feign sleep/suppress laughter when they react.
Magnus: I hooked up with this awesome girl last night, but I think I ruined it with a spoonfart.
by Mr.Boo Fancy Pants February 16, 2014