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English word buck wild comes from English season
season (English)
(intransitive) To become dry and hard, by the escape of the natural juices, or by being penetrated with other substance. (intransitive) To become mature; to grow fit for use; to become adapted to a climate.. (obsolete) To copulate with; to impregnate.. (transitive) Hence, to prepare by drying or hardening, or removal of natural juices. (transitive) To flavour food with spices, herbs or [...]
mating season (English)
A time of the year during which members of a certain species of animal tend to mate.
buck wild (English)
(African American Vernacular English, slang) Crazy, unrestrained, uncontrolled.