From the gesture of putting up two thumbs instead of just one; see thumbs up.
"two-thumbs-up." YourDictionary, n.d. Web. 07 December 2018. <https://www.yourdictionary.com/two-thumbs-up>.
two-thumbs-up. (n.d.). Retrieved December 07th, 2018, from https://www.yourdictionary.com/two-thumbs-up
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