Difficult to describe exactly what it is without a context but it is similar to "very much" or "a lot". Check examples.
Guy 1: When you ate all that curry did you not get fierce shits?
Guy 2: Holy fuck, I got the shits something wicked.
or
Guy 1: When I broke my arm, holy fuck, it hurt something wicked!
Guy 2: Ouch.
9👍 1👎