Covering a person with a blanket, and then farting under the blanket, making sure the fart remains trapped in the blanket bio-sphere. The desired effect is that your dutch oven occupant will have no choice but to inhale the noxious fumes.
Scotty was being such a douche, Nick and I had little recourse but to give him a dutch oven.
A Dutch oven is where you let of a gastly fart under the bed covers and trap it while your girlfriend is out of the room; when she gets back in bed, you force her innocent face under the sheets to see if the odour makes her vomit.
"Pete, last night i Dutch ovened my girlfriend! I wish it had made her vomit though..."
Dutch oven is when you fart under the covers and the smell seeps out to your nose as soon as you lift the covers up. Because the smell is concentrated by the time it gets to you, it's ten times worse (or better, up to you) than it normally would be.
I farted under the covers. This is also known as the act of (or creating a) Dutch oven.