look up any word, like mexican microwave:
 
1.
(n) A fairly quiet girl that reads and studies a lot, but gets intoxicated on Friday and Saturday nights. Most slephanies usually don't recall their slephanieness from the night before, and slephanies are usually fiercely opposed to being labeled a slephanie, but most of their friends know the truth nonetheless.

The exact etymology of the word is hotly debated by scholars, but the general consensus is that "slephanie" was originally derived from sloppy and may be related to a word with almost an identical meaning - sliz.
She was being such a slephanie last night, and she doesn't even remember!

Sleph-a-nie!!!!
by Kate L. September 07, 2010