Bucharest backfire

[Agnes]

event - While attempting to stick a finger, animal, or other [foreign object] into a partners anus, a [Bucharest] Backfire occurs when the partner farts (or, in the worst case, actually defecates), rejecting the foreign intruder. Extra points if, while ejecting the finger, the fart sounds extra loud and high-pitched.
origins - The saying is thought to be based on the fact that Bucharest, the capital of Romania, is a shithole. [Like a banshee] ejecting an unsuspecting tourist from Romania, sometimes a persons ass has its own similar defense mechanism.