River Billy 

Any persons originating from the delta area of northern California, typically displaying distinct behaviors and mannerisms isolated to the region.

Wow, that Kelly sure is a river billy, she's delta through and through.

River Billy by J-st November 25, 2011

Riverbilly 

A redneck, like a hillbilly but instead of being in the hills and mountains riverbilly leave near a river.

Josh is no hillbilly, he is a damn riverbilly

That riverbilly is out fishing again for the third time.

Riverbilly by Makermaker May 18, 2017

Riverbilly 

Much the same as a hillbilly, but by a river.

Riverbilly : a hick that lives by a river.

If riverbillies ever get a divorce, would they still be cousins?

Riverbilly by KenFrogDog August 21, 2021