The rumbling cacophony of far-off Fireworks or Mortars, usually heard after the sun goes down.
Spouse: Is that Thunder?
You: Yeah, Redneck Thunder...
(noun) When you think you hear thunder but you see no lightning and realize that it was just the engine of a large jacked-up truck. This happens commonly in the south.
(hears crackling sound) "Whoa!" "We should get out of the pool man, it must be storming. "
"Nah man, it's just redneck thunder, a bunch of people are headed to the mud bog. "
"Ah ok, we're fine then."