Gopher Ball 

A home run or round tripper, a combination of "Go four" as in the number of bases you round on a home run.

The pitcher threw too many gopher balls and was taken out of the game.

Gopher Ball by Josie Becker December 15, 2008

gopher ball 

As in "go for" ball, used in baseball to refer to a pitch hit for a homerun.

Don't throw a hanging curve with a 2-0 count...gopher ball for sure.

gopher ball by Fox Horn May 5, 2005