This exchange occurs in Terry Pratchett‘s I Shall Wear Midnight (paperback page 398):
‘Lollygagging again, as usual, Lance Private Preston?’
Preston saluted smartly, ‘You are correct in your surmise, Sergeant; you have voiced an absolute truth.’
This is technically correct; Preston is having an informal chat with the protagonist, Tiffany Aching. However, something tells me Pratchett wasn’t just referring to the common definition (‘To dawdle; to be lazy or idle; to avoid necessary work or effort.’), but I can’t seem to find a more extensive definition or etymology online.