This is an odd one for me, I have seen this term used for beer and a bourbon chaser, admittedly mainly in Byrons I give you... but I recently heard it used in a pub for a pint of bitter and a whisky ( a rather nice Tomasin which I doubt went well with the overly hopped IPA however each to their own).
Does anyone know what the term 'Boilermaker' refers to? The whisky is served in a separate glass alongside just in case people are not sure what I mean.
That said I quite enjoy whisky alongside a beer on the odd occasion, such as a stout with a peaty whisky. Sweeter whiskies go well with bitters but so far I haven't had a whisky that I would think would go well with IPAs.