Gooshball is a game where u fill a ballon with cum till it will easily pop. Have 2 unexpecting girls play balloon toss catching it with their elbows out in front of their faces taking a step back every toss till it pops!
Take a balloon and have you and friends/strangers fill it with cum.take the balloon with other decoy water balloons to either the beach or park where girls are at and get them to play water balloon toss. Teach them your elbow method of catching and let them at it. It should be farely easy to determine the winner of gooshball.