2) The atmosphere created by someone who's had a poo in a nearby toilet, and the smell has filtered throughout the whole house or general area
3) An uncomfortable social atmosphere created by a person who's farted in public (usually in a small, unventilated space).
Derived from this is the measure of unit: 'crapmospheric pressure'.
1b. You wouldn't believe the crapmosphere after I called my boyfriend by the wrong name during sex the other night.
2. Hey- don't go on the second floor- Eleri just had a huge dump and created a crapmosphere!
3. "You can't fart in the car Carly! There's no way to get away from the crapmosphere!"