fire crotch n. a person with red (pubic) hair. (source: Double-Tongued Dictionary)
Further reading
Ever wonder what medieval England looked and sounded like? In Old English, the word hord meant “treasure” and your wordhord was the treasure of words locked up inside you. A delightful new book uses the language of that period to create...
Among ham radio enthusiasts, the word Elmer has become an affectionate term for an experienced ham radio operator who mentors a novice. It’s also used as a verb: Elmering someone means helping a new ham. The term was coined in a 1971 magazine...
“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