A fifteen 

A fifteen out of 10, much hotter than a regular 10 out of 10.

That Jessica is such a fifteen

A fifteen by JimmyDicky July 4, 2017

taking a fifteen 

to take a fifteen minute break in order to masturbate or have quick sexual relations with a partner in a random room.

dude, adam and steve are taking a fifteen in the garage--do not go in there.

taking a fifteen by Brian Bryant October 14, 2008

Fifteen-and-a-half 

The age that a girl is often most sexually appealing, but is 6 months too young to legally engage in intercourse (in Britain)

"She was fifteen-and-a-half, I mean what's six months? And she looked a lot older in that basque."

Fifteen-and-a-half by Andy Tiger May 29, 2005

make a $ outta fifteen 

hustle to make money, by any means not on the books, so to speak.

Shoot craps, make a $ outta 15 centavos...

make a $ outta fifteen by yygsgsdrassill January 6, 2004

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