Unnecessary maintenance, tweaking or upgrading of an already functioning mechanical object for minimal or cosmetic benefit, recreation or bragging rights, or simply because "man can".
It is typically performed by men and misunderstood by their female associates.
Wife: "What are you doing?"
Husband: "I'm boring out the cylinder on the Whipper Snipper and fitting a fat exhaust."
Wife: "Oh, manchanics."
by Gulf October 15, 2008

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