To take a shit or fart of God-like magnitude in a very unpleasant sounding, looking and smelling way. Typical examples can be found in public bathrooms, or after taco night.
Ripping Ass is the action of torturing someone by farting in their face repeatedly until wet farts start to occur then lowering your ass on to the tortured persons face so they are forced to smell the farts that you are ripping from your ass