Definitions for wallyballˈwɒl iˌbɔl, ˈwɔ li-
Random House Webster's College Dictionary
wal•ly•ballˈwɒl iˌbɔl, ˈwɔ li-(n.)
a game similar to volleyball played in a walled court so that the ball may be bounced against the walls.
Origin of wallyball:
1985–90; b. wall and volleyball
A fast-paced sport, sometimes called rebound volleyball, similar to volleyball.
Origin: Invented by Joe Garcia in 1979; from wall and volleyball.