When your giving it to your girl hard and you bust ass just as you pull out and spray your load.
OMG you guys I was banging my girl on the top bunk of the trailer and I totally had a flatchgasm! I thought she was going to Ralph as she rolled off the bed and ran away. Fucking great.
Exposing an individual or group to a fart in a situation from which the victim(s) cannot easily escape. The most well-know example is the classic dutch oven technique, wherein one pulls bedcovers over the intended victim. Also applies in elevators, moving vehicles, and other confined spaces.
We were riding with Howard and he unleashed an epic ass cloud in the car. I thought I was gonna die.
"Hey so really what do you think of my new girlfriend?"
"Dude, she's totally flatacular!"
"Hey! What the hell's that supposed to mean?!"
"Err.. She's totally hot but has tiny ...err ... tits."
"Hey! What the hell!"