Noun: A smartphone that's screen is cracked, but still oddly functional, signifying that you most likely left it in your back pocket and sat on it, or had it shuffle out of your pants and it landed incorrectly on the ground. A Sorority Girl phone often occurs because college-age female clothing does not have real pockets, as to preserve the feminine form. Because the Sorority Girl Phone works perfectly, you will continually use it, and you will tell a different story than how it actually got damaged, because said story is often bland and uninteresting.
I used to have a nice, white, iPhone 5. Now it's a sorority girl phone. I'm going to go purchase some Starbucks and spend my night in my yoga pants.