What is "forkball"

n. A baseball pitch, much like the sinker.

The forkball is a type of pitch in baseball. Related to the split-finger fastball, the forkball is held between the first two fingers and thrown hard, snapping the wrist.

The forkball differs from the split-fingered fastball, however, in that the ball is jammed deeper between the first two fingers. The result is that the forkball is generally thrown slightly slower than the splitter, but has more of a "tumbling" action akin to the movement of a 12–6 curveball, as it will drop off the plate before it gets to the catcher's mitt.