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English word nutty slack comes from English slack
slack (English)
(countable) A tidal marsh or shallow, that periodically fills and drains.. (countable) A valley, or small, shallow dell.. (uncountable) Small coal; coal dust.. (uncountable) The part of anything that hangs loose, having no strain upon it. (slang, West Indies) vulgar; sexually explicit, especially in dancehall music. Lax; not tense; not hard drawn; not firmly extended.. Not violent, rapid, or [...]
nutty slack (English)
(UK) A cheap fuel consisting of slack (coal dust) and small lumps of coal (nuts); unlike other solid fuel it was not rationed during the period after World War II.