The term 'Sly Guy' can be broken down into four crossword solutions: Stallone (8 letters), Rambo (5 letters), Sharpie (7 letters), and SNEAK (5 letters). Sylvester Stallone is an American actor, director, producer, and screenwriter who is best known for his roles in the Rocky and Rambo franchises. The word 'Rambo' is derived from the character John Rambo, a Vietnam War veteran played by Stallone in the Rambo film series. A Sharpie is a brand of permanent marker used for writing on surfaces such as paper, plastic, or stone. Finally, the word 'SNEAK' is defined as to move quietly or stealthily, often with the intention of avoiding detection. All of these words are related to the term 'Sly Guy', which is someone who is cunning and crafty.