The phrase "blue rinse" refers to a hairstyle that is popular among older people, especially women, who dye their hair a pale blue or silver color. Full definition
These slim fit jeans feature a vintage blue rinse, classic five - pocket styling, and denim fabric with a touch of stretch for comfort and a perfect fit.99 % cotton, 1 % spandex.Zip fly.Five pocket styling.Low rise - 10 inch front rise.Straight leg - 17 inch leg opening.Slim Fit.Imported.Machine Washable (menswearhouse.com)
From blue rinses to ordinary cider, Anoosh Chakelian looks at the lessons of today's budget statement (totalpolitics.com)
Mid way through, the narrator said that «at one time it seemed impossible to turn the tide of fascism, until good men and women stood in the way,» the good men and women presumably not being Conservative blue rinses but solid working class people and their Fabian masters. (conservativehome.blogs.com)