While I will note that the "fucking cool" bit struck me as being extremely out-of-character with regard to my initial "Tilly-as-ingenue" impressions, I will also note that there is such a thing as "Army Creole" (a term I understand to have been popularized by Tom Wolfe), a dialect that very specifically originated in military circles, in which "fuck" and all its inflections are reduced to a meaningless intensifier.