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English word freaky-deaky comes from English freak
freak (English)
Strange, weird (intransitive) To experience reality withdrawal, or hallucinations (nightmarish), to behave irrational or unconventional due to drug use.. (intransitive) To react extremely or irrationally, usually under distress or discomposure. (transitive) To be placed or place someone under the influence of a psychedelic drug. (transitive) To make greatly distressed and/or a discomposed [...]
freaky (English)
(slang) Odd; bizarre; unusual.. (slang) Scary; frightening.. (slang) Sexually deviant.. Resembling a freak.
freaky-deaky (English)
(slang) Freakish, weird or unusual.