Disorder or confusion, or speed without thought (as in 'helter-skelter').
From Middle English 'skelteren,' possibly from Scandinavian roots meaning 'to scatter.' The word is rarely used alone today, mostly appearing in the phrase 'helter-skelter.'
The phrase 'helter-skelter' became famous as the name Charles Manson gave to his apocalyptic plans in the 1960s, which made the phrase sound sinister. But 'helter-skelter' has been used since the 1600s simply to mean chaotic or disorderly—it's originally a playful word!
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