happens when a girl's ass hole is so stretched out from over penatration, that when she farts it sounds like Darth Vader exhailing.
the other day sally let out a sluttybumfart in my face when she bent down to grab her dropped pencil.

or

"man i would love to give your mom the sluttybumfarts"
by jimmydrysack89 April 19, 2009
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