1. Slang for a thin, pointy penis. Practically
useless for anybody but the owner of said Sharpie, the common response to inquiries regarding
one's Sharpie is "None of your business."
2. A brand of permanent markers used to write on almost any surface with pinpoint "sharpness", thus the
name "Sharpie".
Joaquin: "Hey, Rob, do you have a Sharpie?" (referring to a marker)
Rob: "Y'know what,
Joaquin, that's none of your
business." (referring to his penis.)