Top Definition
A sister phrase to the popular "Freshman 15" that refers to how fat Senior girls get due to excessive partying and beer drinking during their final year in college.
Guy #1: That Holly girl used to be hot right, what happened to her? - Guy #2: She let herself go and gained her senior 15 like a fat slob, what a shame.
by Kiva April 30, 2006
6 Words related to Senior 15

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.