A dutch oven is a slang term for pulling a cover over someone's head while in bed and flatulating, thereby creating an area of foul-odored air in an enclosed space that must be inhaled. This is done as a prank or by accident to one's sleeping partner.
A connection between relationships and performing a Dutch oven has been discussed in two undergraduate student newspaper articles and in actress Diane Farr's relationships/humor book The Girl Code.
The book The Alphabet of Manliness discusses the Dutch oven and a phenomenon it refers to as the "Dutch oven surprise", that "happens if you force it too hard". The Illustrated Dictionary of Sex refers to this as a Dutch treat.
http://en.wikipedia.org/wiki/Dutch_oven_(practical_joke) (перевод выше - мой, сорре за присущую костноязычность)