The same as redneck or hick. A person that likes to get his truck muddy by going off the roads into the backwoods.
I like to get my truck muddy every weekend, I guess you could say I'm a mudback.

Can a mudback get a beer around here.

What's up my mudback.

Did you go mud backing this weekend, I'm just saying because your truck is all muddy.
by Equal crack January 26, 2016
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