What is the meaning of Sharpie?

An alert person.

A knowledgeable fisherman.

A swindler.

A long, narrow fishing boat used in shallow waters.

Clipping of sharp-shinned hawk.

A member of a violent, fashionably dressed youth gang of the 1960s and 1970s.

A Sharpie or other brand of felt-tipped marker pen.

Source: wiktionary.org