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1.
not totally unlike a shart a flarple is used to describe the passing of gass with the anus sphincter walls vibrating to produce a rumbling bass effect, with a hint of lubrication to create a lower ending sound. Can also be used as a put-down
That fart sounded like a real flarple.

Hey you f'ing flarple why did you do that?
by Judge Shmendric January 18, 2008
 
2.
When you need to fart and it somehow winds up bubbling out the front way through your vagina flaps and makes kind of a "flarple flarple" sound.
The princess was mortified after she flarpled infront of her potential suiter at the ball.
by Tournikel September 11, 2011