Fifteens 

"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

Fifteens by Jaynik August 27, 2008

Four Fifteens 

A slang word most commonly used in modern african american culture referencing four fifteen inch subwoofer car speakers.

ay nigga my four fifteens woke up yo neighbors.

Four Fifteens by DROverdosed89 November 25, 2009

fiance fifteen 

the fifteen pounds that many girls lose between their engagement and their wedding.

look at that skinny bitch! she's lost a lot of weight since she got engaged.

well, you know she can't fit in her wedding dress without losing that fiance fifteen. she bought a size 2.

fiance fifteen by wesleywhatwhat July 13, 2010

fifteen minutes 

A proverbial period of time for one's short-lived fame.

This band's fifteen minutes are just about up because nobody listens to them anymore.

fifteen minutes by Albert February 15, 2004

Facebook Fifteen 

The shortlived fame someone seeks and receives by doing something stupid only for people to forget about it shortly thereafter upon realizing its insignificance.

Joe: dude, did you hear about that girl that drank 20 red bulls a day?
Jeff: yeah, she just wanted her Facebook Fifteen

Facebook Fifteen by Dirk Pitt June 27, 2017

Fifteen hundred is good. Your captain will be pleased. 

Quote from the video game Mass Effect, spoken by Nihlus. Used to unenthusiastically congratulate someone.

Joker: Drift, just under 1500K.
Nihlus: Fifteen hundred is good. Your captain will be pleased.

Mort: Holy crap! I got into MIT!
Mort's Father: MIT is good. Your captain will be pleased.

Fifteen hundred is good. Your captain will be pleased. by Nihlus November 21, 2010

Pen Fifteen 

Pen Fifteen, translated to pen15, then translated from leet, means penis. Used by sofisticated nerd everywhere

User name 'Pen fifteen'
OMG look @ his Pen Fifteen

Pen Fifteen by SensenmanN December 12, 2005