One of the worst ages of being a teenager. You are in the middle and you wind up with the most problems that age. You are too young to drive without an adult, cannot go to the prom, and get a part time job like real teenagers. Your head is up your ass and one day you are still a kid watching cartoons and another day you'll like to have sex. This is also the age when most teen problems occur such as anorexia and cutting.

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An age in a person's life when they aren't a kid, an adult or even a preteen but a teenager.

As seen on How I Met Your Mother, used in reference to your cards in a game of blackjack, but about the bang-ability rating of a girl. In blackjack, a player says "hit" if he wants another card. Trying not to go over 21, 15 can be a bad hand, because the blackjack player isn't sure if he wants to hit or not.

noun.

A '15' (pronounced 'quince' keen-seh) or a 'Quinceañera' is the milestone birthday party that Mexican girls and their families throw in honor of the big one-five. It symbolizes a girl becoming a woman.
And let's be honest, it's also an excuse to throw a huge ass party, because we Mexicans love throwing big parties.

Pee is 1, and Poo is 2, so 1.5 is diarhhea. Not quite liquid, not quite solid, but everyone's favorite.

Any girl under eighteen who lies about her age. Closley related to the term jailbait but more devious.