laughing gasnoun [ U ]uk /ˈlɑː.fɪŋ ˌɡæs/ us /ˈlæf.ɪŋ ˌɡæs/ informal
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(Definition of “laughing gas” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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an informal style of dancing with energetic movements, that was developed outside in the street or in nightclubs; one of the different forms of this style of dancing