So you’re not going to tell us the phrase he actually said then? I’ll assume he was offering to have the ‘last suck on this fag’ At least he wasn’t asking to get the last cigarette for free, and therefore would be looking to ‘bum a fag’ All manner of confusion would ensue I’d assume, also being a Brit and I have never heard ‘fag’ being recognised as a slur here, it only means either cigarette or to do mundane tasks for older boys in public(private boarding) schools “oh Tarquin, have you heard? Simpkins is fagging for Fontleroy don’t you know?”