An American conservative who hides their blatant racism, bigotry, hate, and disdain for the actual United States motto (E. Pluribus Unum - "Out of Many, One.") behind a disingenuous use of the American flag, thus metaphorically wiping their ass with it. The sort of person who tells people who speak a foreign language to "Go back to your country" but has a warped version of an American flag on their lifted Dodge RAM truck; A general term for a conservative.
"That guy shouting about Mexicans and blacks while waving the Stars and Stripes at the Trump rally is such a flag-wiper."
"Any time you see some flag-wiper driving around in their big pickup truck, rolling coal and acting like a complete asshole, don't forget what party they represent."