When A large cheeze pizza is shoved up a Firecrotches ass piece by piece and then a hot man with a large jake (see definition of jake) has anal sex to get the Pizza out. The sauce is then licked off the penis by the fire crotch. This act of anal and oral sex is rarely done and only with a true firecrotch.
Lindsey Lohan isn't a firecrotch because of her red pubes. She's a firecrotch because of that nasty case of herpes she got from scissor-fucking Paris Hilton.