postfartum depression 

When you let out such a relieving, loud, or satisfying fart that you get depressed when its finally over.

Joe got a bad case of postfartum depression after he perfectly replicated a trumpet with his ass.

postfartum depression by P-scrizzle December 17, 2015

post festum 

after the party

The value of a commodity can only be determined post festum, that is, upon returning from the orgy of circulation.

post festum by Apersonificationoflabour June 20, 2011

postfartum depression 

Remorse following the act of flatulating. Cause can be various. E.g., one tries to flatulate but soils one's underwear as well (see shart); one's flatus turns out to have an unexpectedly unpleasant quality (usually strength or abundance); (most common) an attractive person approaches after one has flatulated, leading to panic and lost opportunities for flirtation and/or sex.

The boys had fun horsing around in the car on the freeway until one of them sharted. There was nowhere to stop. Their laughter died out and postfartum depression kicked in.

postfartum depression by The Glandsman's Apprentice January 17, 2008

Postfartum Depression 

The feeling of remorse, disgust, or overall awkwardness that comes over an individual or group after someone farts, usually used when the flatulence has ruined the mood or flow.

The night was going great until Micky farted and everyone got postfartum depression.

Postfartum Depression by DEER0123 October 22, 2010