noun

• (colloquial) An alert person.
• (US, regional) A knowledgeable fisherman.
• (US) A swindler.
• (US) A long, narrow fishing boat used in shallow waters.
• (Australia) A member of a violent, fashionably dressed youth gang of the 1960s and 1970s.
• A Sharpie or other brand of felt-tipped marker pen.
• Trademark for a pointed, felt-tipped marker pen, used primarily for labeling items in boldface, signing autographs, etc.
• (birdwatching) Clipping of sharp-shinned hawk. [Accipiter striatus, the smallest hawk to reside in USA and Canada, which preys on songbirds.]