Mouth
Open up
Open up verb - Talk freely and without inhibition.
Both terms in one sentence
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When Baby Butter has to have a checkup at the dentist, it's how Peanut and Jelly get her to open up her mouth so that her new tooth can be examined, by getting her to giggle.
Source: Western Animation / PB&J Otter - There was a more explicit cover of YSMR, with the line "open up your fucking mouth, watch out here I cum".
Source: Intercourse with You -
He picks up a very bored-looking hitchhiker and starts to fall back...only for the hitchhiker's stomach to open up into a mouth and eat him.
Source: Hostile Hitchhiker
Cite this Source
Open up and Mouth. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/mouth/open_up
Mouth & Open up. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/mouth/open_up>.
Open up or Mouth. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/mouth/open_up.
Google Ngram Viewer shows how "mouth" and "open up" have occurred on timeline