Wiktionary
n. (context idiomatic slang LGBT English) A female who dresses up in men's clothing, typically for public performance.
Wikipedia
Drag kings are mostly female performance artists who dress in masculine drag and personify male gender stereotypes as part of an individual or group routine. They may be heterosexual, lesbian, bisexual, transgender, genderqueer, or otherwise part of the LGBT community. A typical drag show may incorporate dancing, acting, stand-up comedy, and singing, either live or lip-synching to pre-recorded tracks. Drag kings often perform as exaggeratedly macho male characters, portray marginalized masculinities such as construction workers, rappers, or they will impersonate male celebrities like Elvis Presley, Michael Jackson, and Tim McGraw.
In the late 1800s and early 1900s, several drag kings became British music hall stars, and British pantomime has preserved the tradition of women performing in male roles. Starting in the mid-1990s, drag kings started to gain some of the fame and attention that drag queens have known.