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6.
v. the act of coitus (slang)
beavis: i think i like her.
butthead: did you bust a fifteen?
by slithering November 30, 2004
 
1.
Fifteen is the age in a boy's life where everything sucks. Period.
Your body turns against you in every way possible. Pimples, voice cracks, terrible body odor, unnecessary hair, constant horniness, and greasy skin and hair. Hormones run wild throughout your body producing an array of emotions you can't even understand let alone deal with.
Meanwhile, you have to deal with high school. Projects, homework, hard subjects, sadistic teachers, social crap to sort out, finding allies; they are very hard and common things there.
Also, all the girls you meet at school seem to flourishing into beautiful women. Their wonderful breasts jiggle and taunt you, although you can't have them. The mean ones make fun of you, the nice ones try to humor you, and if you find an absolutely great one that's willing to be your gal, good luck getting the money to pay for her. Businesses won't hire you for a year or so even if you did have the time to work a shitty job.
And there is no relief from this hell that is your life. Doing drugs or alcohol is a temporary release, if you can find, pay for, and not get caught with it. You're just barely smart enough not to commit suicide or run away from home. And you know that porn you're always watching will eventually get you in trouble. All you can do is wait it out.
Also, 15 is the fifteenth number from zero
Dude, why are you so down?
I'm fifteen.
Dude, sorry.

and

3x5=15
by roberto151 February 22, 2010
 
2.
A rating given to a girl if you're not sure if you'd hit that. Refers to blackjack.
M1: That stripper was a fifteen.
M2: She was 15?
M1: No, she was A 15...like in blackjack.
M2: Niiiice.
by Barney S. December 29, 2007
 
3.
"Fifteeens" refer to 15 inch subwoofers in a car audio system.

For those who don't know, that's fuckin huge. And the shit kicks.
And like a fiend fo' the weed I'll tweak.
4 Fifteens in yo' trunk that's beat,
Proper ass amps, Zapco, Alpine.
Put the coke on the dash,
roll a dolla do a line.
-Andre Nickatina

I'm takin' chunks from punks who want funk,
Treat em like 15's, put em in the trunk.
-Brotha Lynch Hung
by Jaynik July 31, 2008
 
4.
purely and simply an alternative to "fuck". the term most likely came out of the austin, tx area in the mid 90's when austin uber alles experienced its new sexual revolution and casual sex became commonplace. fifteen, then, probably refers to the amount of time a good casual fuck takes- 15 minutes. perhaps the reference is to amount of positions.
we got so horny that we decided to fifteen right there on her parents bed.
by hari krishna November 29, 2004
 
5.
Fifteen is a slang word used by white people to inconspicuously refer to a black person. Rumor is that it originated because 15 is the number on the black crayon in a box of crayola's.
Luk you stole my seat, you're such a fifteen.
by Smack69 November 01, 2007
 
7.
an age that suks sixteens the year we all wanna be
duh
fifteen suks
not worth being fifteen
by xdcrfvtgyxdcrgvyhbunji August 27, 2008