When one farts in a coffin before it is closed.
Matt dutch coffined Danny at his open casket so that he could take that stink with him to the grave
When a person, male or female, passes gas in a tanning bed and must either a) open the door to relieve the smell or b) stay inside the bed to prevent spotting. Similar to dutch oven.
Summer: Guys, yesterday I was tanning at Planet Tan and I farted in the 20 minute bed. I dutch coffined myself.
Jamie: Wow, you disgust me.