fire crotch n. a person with red (pubic) hair. (source: Double-Tongued Dictionary)
Further reading
Samantha Harvey’s novel Orbital is a sensuous, exhilarating meditation about the strangeness of life on a space station, with its mix of tedious tasks and jaw-dropping views. And: a musician who rode the rails in his youth shares the slang he...
Steve, a singer-songwriter from Rock Springs, Wyoming, shares some slang he picked up while months riding the rails and busking. Spanging refers to panhandling, from asking for “spare change.” The term bull refers to a type of security...
“Firecrotch” gained a new degree of legitimacy (or notoriety) when it appeared in “Law & Order: Criminal Intent” Episode 135: “Seeds” (Season 7, first aired Oct 11, 2007).
Provocating and antagonistic Suspect Jason Rush (actor August Emerson) lashes back at even more provocating and antagonistic (and flaming-red-haired) Detective Nola Falacci (Alicia Witt):
Jason Rush (yelling at Nola Falacci): “Anything else you want to see, firecrotch?”
According to TV.com, this use of ‘firecrotch’ was “ripped from the headlines” of the Davis/Lohan incident by L&O;:CI writers.
RDB