The word 'whoo-hoo' belongs to the large category of expressive interjections in English that imitate or elaborate upon natural human exclamations. It is a reduplication, a common linguistic process for creating words that convey repetition, intensity, or playfulness, seen in other examples like 'yo-yo' or 'chit-chat'. Emerging in the 20th century, it stylizes the spontaneous sounds of cheering or shouting, capturing a sense of unrestrained celebration. Its logic is purely phonetic and emotional, designed to phonetically mimic a rising pitch of excitement ('whoo') followed by an explosive release ('hoo'), rather than deriving from a historical root with a concrete meaning.

This is a reduplicative interjection, a type of sound-symbolic word formed by the playful repetition and variation of a syllable. It does not contain separable morphemes with distinct historical origins or functional roles.