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.
by daniel f ring September 12, 2014
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
by daniel f ring August 11, 2014
by daniel f ring September 17, 2005