To drive very fast. To go so fast that your skin is pulled backward. Skunt is a southern way of saying "skinned". So, one is going so fast he is being skinned back.
When some stinky smell is coming out from the butt part of the body.
Being farty, having flatulence, cut the cheese.
Having excessive stomach or intestinal gas which can result in passing of gas from the rectum.
James : WTF was with the spunk backfire?! You got it all over my t-shit!
Alice : *Nervous Laugh*, sorry.
James : Bitch! Oh yer btw, I have herpes.
Alice : Mmmm.