An electronic file folder or other compiling containing unflattering videos, photos, Snapchats, texts, etc. of a friend for future roast, embarrassment, or blackmail.
*Takes picture of friend sleeping with mouth wide open* "I'll add this to my roast file." *Cackles*
A nail file can be used to shape your nails to prevent hurting a pussy when fingering it.
I saw in a video that it is recommended to cut and shape your nails before fingering a woman. I never thought a nail file could be useful for a man also!