From arse + smart, because the plant stings when it touches bare skin, and was often laid in beds to kill fleas.
"arsesmart." YourDictionary, n.d. Web. 11 November 2018. <https://www.yourdictionary.com/arsesmart>.
arsesmart. (n.d.). Retrieved November 11th, 2018, from https://www.yourdictionary.com/arsesmart
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