When you release such a powerful fart that it causes visual ripples to appear in your underwear, or skirt if your a girl
Example 1
Micheal: Dude! Check this out
Tim: What dude.
Micheal: *Points butt out and causes a fart to ripple in his underwear*
Tim: Wow dude. That was awesome
Example 2
Rochelle: Girl, my stomach hurts
Julia: Maybe you need to fart
Rochelle: I don’t fart
Rochelle: *Fart ripples her skirt*
Julia: I think you just did a Ripple Fart
Rochelle: No I didn’t, my panties are fine
Julia: No, a ripple Fart is when your fart causes you pants to ripple
Rochelle: Oh
A fart so loud and powerful that not only will you worry if you've sharted, but the shock waves created by the booming sound, will ripple the skin along your taint.
Peggy Sue got the shock of her life. With Pete going down on her after their meal of chilli with beans, she let rip with what Pete later described as a taint-rippling fart. He could see the skin of her taint ripple with the explosion emanating from her arse.
When you fart, but only the top half of your butt vibrates.
That was a weird top butt ripple fart.