A red cunt hair (also RCH,[1][2] red pussy hair, and red one[3]) is a notional unit of infinitesimal[4][5] measure.[6][7] It is a slang, tongue-in-cheek term that does not describe a concrete unit of measure, but instead exists as a subjective notion, and can change depending on the situation in which it is used. The term is based on the concept of a pubic hair being small in diameter, and can be used to describe a minor adjustment necessary, and is akin to terms such as 'a tad', 'a smidgen', etc. The phrase is generally used to objectify small clearances, dimensions, or distances.[8] In usage, the terms "hair", "cunt hair" and "red cunt hair" are related and each one is considered smaller and more precise than the preceeding one ("hair" being largest and "red cunt hair" being smallest).[9] No other color is used with this term.[5] It is thought to have originated in the late 1950s, as military slang.[10]
"Oh, just another RCH," replies the perfectionist. "What's an RCH?" I naively inquire. The crew replies in chorus, "Red Cunt Hair." I was learning a wealth of technical jargon.
"a mortar round came in and missed you by an R.C.H. [an R.C.H. being survivors' lingo for somthing very thin—a Red Cunt Hair] and that sucker missed you by one of those
red one [...] a very short distance. A euphemized abbreviation of RED CUNT HAIR. red pussy hair - a very short distnace. Slightly less offensive than RED CUNT HAIR.
RCH (noun) a tiny notional unit of measure (US) An abbreviation of RED CUNT HAIR, perceived as a smaller unit even than a simple CUNT HAIR
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Small measurements are frequently referred to as "just a cunt hair," or, if more accuracy is preferred, as a "red cunt hair" (no other color is ever used).
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Red cunt hair. A very small distance (as in, "That is one red cunt hair out of alignment.").
Bump it a little west now, a hair more, a cunt hair now ... a red cunt hair ... good.