Commonly mistaken for the cultural-unity people feel in-griping about tax-woes (like surviving tornadoes) it refers to where taxidermists see it not as that the only things certain in-life are death and taxes, as death and taxidermy (as some are wild mountain-folk who avoid taxes) and so every new roadkill is a new opportunity.
-- Say, lookey here, we don't pay taxes, and I'm about all talked-out cussin' the government and the weather, what to chew the fat over?
-- You read my mind. Look, some roadkill, an opportunity to do some taxidermy.
-- Yeah, it's a real taxitunity.