The term "dragon slayer" refers to a person who is able to overcome or conquer something that is difficult, challenging, or daunting. It often implies an individual who has achieved success in defeating a powerful enemy or overcoming a formidable obstacle. In some cultures and mythologies, dragons are symbolic creatures representing danger, power, and strength - thus slaying one would be seen as a heroic feat. The phrase can also refer to someone who has the ability to excel in their field of work or expertise, often by taking on challenges that others may shy away from.