Similar to the weight college freshman gain in their first year of college, but this is the 15 pounds everyone puts on during finals week. This can be credited to the amount of coffee and snacks consumed while staying up late studying.
Last night I stayed up until 3 A.M. studying for my biology final; I ate a whole box of Cheez-Its, two Little Debbies cream rolls, and four cups of coffee. Yeah, I am definitely going to gain the Finals Fifteen.
by RUFFLESx December 30, 2010
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weight gained in the last year of graduate school as a result of sitting on your ass and writing your thesis/dissertation day after day.
Person A: Has David gained weight? He's looking a little doughy lately.

Person B: Yeah, but it's just the final fifteen. He'll start hitting the gym again after the thesis is finished.
by UCDSocGrad June 4, 2011
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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.
by Brian Bryant August 20, 2008
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a trick played on girls who are sweet, oblivious, innocent girls. a mean girl will ask them to join the pen club. she says"i'm pen 13, she's pen 14, and we want you to be pen 15. the girl, oblivious as she is, says ok! then the mean girl writes PEN15 or PENIS on the girl's hand.
that girl who played the pen fifteen trick is SO evil!!!!
by chinchilasrule February 15, 2008
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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!"
by andie September 20, 2003
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Used to refer to a woman who isn't hot, but also isn't ugly. You aren't quite sure if you want to hit it.

Term is taken from the popular card game of Blackjack, where it can sometimes be difficult to decide if you want to "hit" when your cards add up to 15.
Bob: Oh man, look at her!
Larry: Eh...she's a blackjack fifteen.
Bob: No way. I would totally hit that.
by otis80085 January 8, 2008
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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!
by autumneffect August 20, 2011
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