Fifteen to One Scale 

The theory that for every 15 pounds a man puts on, that he loses 1 inch in penis length, due to the increase in the fat pad on the pubic bone.

Fat? That dude's running a minus on the Fifteen to One scale!

Fifteen to One Scale by Squik da Kitty February 20, 2010

fifteen second rule 

the rule whereby if a college student is present in his dormitory and takes more than fifteen seconds to answer after a knock, one can assume that he is masturbating.

Bill: Matt, are you there? (knocking)

Matt: Yep, hold on.

(waiting)

(waiting)

(waiting)

Bill: Fifteen second rule, you're officially masturbating. (turns around)
Hey everyone! Matt's masturbating!

fifteen second rule by The Iron Fist January 5, 2009

Fifteen Minutes 

the amount of time it takes for one to quickly bang someone (usually in a car)

like in the movie grease, "hey putz... 15 minutes!"

Fifteen Minutes by andie September 20, 2003

Fifteen footer 

The sighting of an assumed attractive person, only to be extremely shocked by the horrid appearance after being only fifteen feet away.

"Hey girl whats goin on- OH GOD NEVER MIND!"

We gotta fifteen footer closing in. Sheild your eyes!

Fifteen footer by autumneffect August 23, 2011

Fifteen Minutes 

How much time Avril has until she's eating from dumpsters again.

*scrounges through dumpster*

"I thought it would last forever! I was soooo hardcore....ohhh, A half-eaten burrito!"

*munch munch*

Fifteen Minutes by Patriot Games April 30, 2003

Fifteen Minutes 

amount of time when a poser or a wannabe shines

avril is taking a little more

Fifteen Minutes by ghosterocksf October 29, 2003

Fifteen year old woman 

A human female who is fifteen years old. The term is used by sexually enlightened people and is the right term to use according to the teen liberation movement.

Kathy is a fifteen year old woman.

Fifteen year old woman by Deep blue 2012 August 7, 2010