'Deliverance' Actor
The Pre-Death Doritos Ad
... with Topless Women

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Just two weeks before he died, a lung cancer-stricken Bill McKinney -- who played the "squeal like a piggie" redneck in "Deliverance" -- starred in a hilarious Doritos commercial ... beside a bunch of topless ladies ... and TMZ has obtained the footage.

The 85-year-old played a creepy old man in the TV spot, submitted as part of Doritos' Crash the Super Bowl contest -- a competition to find the chip company's next big Super Bowl commercial.

It's unclear if Bill's commercial won -- we won't find out 'til game day -- but it's still awesome ... check it out.