What does “boygirlparty” mean?

A boygirlparty is the first party you go to as an adolescent that has all sorts of kids at it (girls and boys) that you’re not used to playing with, It’s exciting and strange. Maybe you play spin-the-bottle. The term, to me, is loaded with all different kinds of child-like wonderment and energy.

Also, boygirlparty is one word. It just is.