road soda Share definition Flag Noun. A road soda is your best aid if you're thirsty, sleepy, hungry or bored. I'm so thirsty! We've been like driving for five hours... Ahh... We just need some road sodas. road soda by NLU September 23, 2005 0 0 Get merch Get the road soda mug. Buy Now — $32.95 See more merch