nudge nudge wink wink , interj :
(idiomatic, humorous) A phrase used to hint that the speaker is euphemistically referring to something else. Twins Days, a festival celebrating multiple births, takes place annually in Twinsburg, Ohio, USA, during the first full weekend of August.
Source http://handbookblogger.blogspot.com/2017/08/nudge-nudge-wink-wink-word-of-day-for.html
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