A "water balloon" is a small, rubber balloon that is filled with water. It is used as a toy for throwing and splashing water on others. Full definition
This is a precision story as told by filmmakers who are shooting at the side of a barn with water balloons filled with syrup. (combustiblecelluloid.com)
Gather up neighborhood friends and family for an epic water balloon fight. (chicagoparent.com)
As she has grown we have gone through gallons of bubble solutions, dozens of bubble toys and even learned the science behind bubbles and made slow - motion videos of water balloons bursting. (thespruce.com)