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A maths-based joke that refers to working towards, but not completely achieving, getting a root. It is essentially a failed attempt to tune or woo a female.
1. "Nah look... I didn't actually root her. It was more of an improper root."

"So nothing happened then."

"Uh... nah, we just chatted."
2. "Old mate Will got an improper root last night."
by YaBoiMattyMC September 10, 2017
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