a person with natural red hair. red hair, means red eyebrows, and rd moustache... soooo they have red pubic hair. which resembles fire, hense fire-crotch. also referred to as gingers.
"That chick had a crazy firecrotch. when i saw her naked, i ran for the fire extinguisher."
A derogetory name for someone with red/ginger/orange hair, indicating that this individual has firey-hued hairs in his or her pubic region. Other names with the same meaning would be: "Rose bush," and "Cherry pie."
-Why did that guy dump his ginger girlfriend?
-He was tired of getting blisters on his dick from her firecrotch.