Even though the parent already replied to you, I'd like to clarify a mistake in your reading for others to learn from: "to fuck off" does not mean to slack or goof off. It refers to leaving some place (generally with an attitude of getting the hell out of Dodge).

You most likely have misconstrued "to fuck off" with "to fuck around." Although the former may be used interchangeably with the latter, it was fairly obvious from the original comment that that is not how it was being used.