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Adjective. Your sister who does or is acting according to a fixed plan or system; methodical and will not budge, no matter what the consequences.
Oh yeah, she was set on doing it - she went all sistermatic!
by And. July 24, 2018
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Describes da regular and methodical manner in which they perform everyday activities at a convent.
I enjoyed frequently visiting a local convent because not only were the nuns pleasant and respectful towards me, but their simple and sistermatic routines of daily living allowed me to usually know what times of the day were best for having a particular nun fellowship with me, sharing meals, etc.
by QuacksO February 16, 2020
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