This expression does not date back to Vietnam or the 80's. it is ancient in the marine corps and is what drill instructors did up until the mid 70's
My Drill Instructor could kick ass and take names."
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what used to be called a nerd in the 50's in milwaukee
john is so square that he's a gleep
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Its is an affirmative expression as pointed out in the many examples. But it is short for "fuckin affimative" NOT fuckin absolutely etc It dates to at least World War two primarily in the marines.
You fuckin a I am going on liberty
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