Mat day (spelt as: Mất dạy) is a Vietnamese insult used to labell an individual as an asshole.
You all are mat days you arseholes!
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Jan 20 is when you can bop your eldest child on the head with a yoga mat, cause they deserve it.
Hey today is Jan 20, you know what that means? It’s national bop your eldest on the head with a yoga mat day!