When a group of guys form a circle around a girl, masturbate into her hair, let it soak in and then use their sperm donation to fix up her hair in a stylish doo. This usually happens before an important school dance or wedding.
Dumb Girl: It's only an hour before prom and I still don't have my hair done. What am I gonna do!?
Some Random Guy: Don't worry girl. Me and the guys can help you out. We'll give you the best perm ever.