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Slang: “Go in swimmin.'”
It took a bit to figure this one out. My internet research is indicating this slang is referring to booze. If the V-Sign or some other two fingered hand symbol was a prohibition signal for booze, I can not find any reference to it.
Here’s a quote from a 1917 poem called WITH PERSHING IN MEXICO using the phrase in the book “Rhymes of the Rookie; Sunny Side of Soldier Service.”
Where the greasers sit a'talking, In the little public square. There's real food there; white women; Most things a man could want; And a pool to go in swimmin' And a Chinese restaurant; Where, across the hot Chop Suey; If you give the Chink a wink, He'll produce a little teapot, Full of something good to drink.