An expulsion of gas from a woman's vagina (box). The gas may or may not have a distintive odor similar to that of a regular fart.
As a Noun - Dude, after I hit it doggystyle she rips a boxfart when we change positions!

As a Verb - When she boxfarts it smells like rotting tuna and fecal matter! Its such a turn-off!

As an Adjective - That skeezer is a nasty boxfarter! Cover your nose when you hit it!
by JuicyJSixtySixSixtyOne April 03, 2010

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