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2.
1. To modify an object to suit another purpose from it's original, often very dangerously, however.

2. To build a tool out of scrapped materials, commonly used in the repair of objects, or to substitute a tool.
As used in a zombie invasion;
Tom: I finally used redneck engineering on a weapon.
(Lifts up a metal pole with a bowie knife attached using massive amounts of duct tape and welding.)
Bill: That'll be useful, man. Good work there!

As used incorrectly:
LOL I REDNEK INGINERED A $10 DOLLAR BOARD GAME WITH MY IPAD! YOU GUIZ WANT TO PLAY WITH YOUR IPOD TOUCHS?
by psew-don-nim December 23, 2010
 
1.
The use of unorthodox methods and tools to build, modify or repair machinery, vehicles, etc, usually with little regard to finesse or technique.

Common tools include: sledgehammers, cutting torches, arc welders, come-alongs, jacks, porta-power kits, large prybars, sawzalls, lengths of pipe and 2 X 4s

So named for the stereotypical redneck who fixes things through brute force and duct tape.
The popular TV shows Monster Garage and Junkyard Wars often feature great masterpieces of redneck engineering
by Dr. Badwrench September 21, 2006
 
3.
1.you fix everything with duck tape
2.when in boy scouts you fix your tent with duck tape
Adam: How you fix your gun.
Clayton: Redneck engineering.
by adam clayton January 17, 2012