What you call a color when then color doesn't matter at all, and you just want to sound falsely urbane or sophisticated. From an episode of the Love Boat when Capt. Stubing proudly paints his cabin "Singapore Sunset Saffron," which Gopher dismissingly calls "yellow."
"Dude, what color iPhone case should I get?" "Personally, I'd go with the Singapore Sunset Saffron this time of year."