In a manner that involves dallying; while engaging in flirtation or wasteful delays, or with a slow, unhurried pace.
From the verb 'dally' plus present participle -ing, plus the adverbial suffix -ly. This creates an adverb describing how an action is performed with dallying characteristics.
This is a delightfully long word for something simple—'slowly and playfully'—but that's exactly how English works: stack suffixes like building blocks to express subtle meanings!
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