What is the X in X-mas?
: screwball anticsnoun
[fr screwy and probably based on screwball2; the -ball of this term is the source of the very productive combining word that yields oddball, nutball, etc]
A pitched ball that moves to the right from a right-handed pitcher and the left from a left-handed pitcher, unlike a curve ball
[1928+ Baseball; said to have been coined by the pitcher Carl Hubbell]