Due to earlier variants of the term, and shades of meaning, FCP has evolved carry a diversity of connotations although all revolve about the mainstay of frugal Christianity.
FCP can be used as a noun, verb, or adjective.
Only an FCP would live here! (referring to a cheap apartment)
Hey CJ what color is your truck? Rust? Naw, I'm just FCP-ing for a while!
The tangled, matted bush that inevitably appears in the pubic region (usually male) after a few weeks on a field course, backpacking holiday etc. where limited personal hygiene facilities are present.