"Alcohol is for drinking, gas is for cleaning parts and nitro is for RACING" -"Big Daddy" Don Garlits What is nitro? To the average layman it's a fancy term that might as well mean "dynamite." Perhaps a shorthand for "nitroglycerin" (the explosive), or even "nitro beer" that gets its fizzy smoothness from being "nitrogenated"?
https://www.hagerty.com/media/motorsports/nitro-revival-2021-explodes-at-irwindale-dragstrip/