A fork of Rural Dictionary
"Doughboy" was a popular nickname for the American infantryman during World War I. Though the origins of the term are not certain, the nickname was still in use as of the early 1940s, when it was gradually replaced by "G.I." as the following generation enlisted in World War II.
It was famously used by Al Capone as he was speaking to Jimmy Darmody in the 2010s Drama "Boardwalk Empire" sentence below.
Jimmy: "Summer of 17 I passed through there on my way to camp Grant""
Al: "Doughboy huh?"
Jimmy: "mhm" (nodding as he was saying yes)