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Often a term used in the automotive industry to conduct a thorough diagnosis of a vehicle usually taking many more hours than is recommended. This is basically one step below completely tearing the car apart.
Brandon: How is the car coming along?
Jeff: I can't seem to figure out what the problem is!
Brandon: You've been working on that car for 3 hours.
Jeff: Yes, I need to perform "diagnostificationism".
by Jeff Pieper May 27, 2008
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