Friends and I were trying to remember the name of this last night, but nobody could come up with it and IMDB is a lost cause. It’s a mid-eighties beach movie - I’d estimate around '86 or '87 - and I think volleyball played a part in the plot. The main thing we remembered about the movie is that a bunch of the characters keep singing “iko iko” (“my flag boy and your flag boy/sitting around the fire/my flag boy says to your flag boy/gonna set your flag on fire/hey now, hey now, hey now, hey now/iko iko away”).
Someone has to know this!