A 15
A 15 is when a girl turns 15 and throws a party so big it makes Burger King look like a snack.
That girl had a 15 and it was the biggest party I've ever seen.
I went to a 15 and it was like a million people and I didn't even know who half of them were.
My friend had a 15 and it was so big it took two days to clean up.