wildcat (n.)

undomesticated cat, early 14c. (late 12c. as a surname), from wild (adj.) + cat (n.). Meaning "savage woman" is recorded from 1570s; sense of "one who forms rash projects" is attested from 1812. The adjective in the financial speculative sense is first recorded 1838, American English.

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Definitions of wildcat
wildcat (n.)
an exploratory oil well drilled in land not known to be an oil field;
Synonyms: wildcat well
wildcat (n.)
a cruelly rapacious person;
Synonyms: beast / wolf / savage / brute
wildcat (n.)
any small or medium-sized cat resembling the domestic cat and living in the wild;
wildcat (adj.)
outside the bounds of legitimate or ethical business practices;
wildcat life insurance schemes
a wildcat airline
wildcat stock speculation
wildcat currency issued by irresponsible banks
wildcat (adj.)
without official authorization;
wildcat work stoppage
Synonyms: unauthorized / unauthorised
wildcat (adj.)
(of a mine or oil well) drilled speculatively in an area not known to be productive;
drilling there would be strictly a wildcat operation
a wildcat mine
wildcat wells
wildcat drilling