slack-jaw
n.— «That little prelude of pidgin Shakespeare has surely shooed the slack-jaws to the comics pages, so now let’s howl with indignation, you and me, at the horror of summer reality TV.» —“Real losers!” by Jonathan Storm Philadelphia Inquirer (Pa.) Aug. 20, 2005. (source: Double-Tongued Dictionary)
Further reading
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Diamond dust, tapioca snow, and sugar icebergs — a 1955 glossary of arctic and subarctic terms describes the environment in ways that sound poetic. And a mom says her son is dating someone who’s non-binary. She supports their relationship, but...