The act of two or more sisters engaging in sexual intercourse with one or more men, usually in a threesome or an orgy.
Ah, if only Brigid had a twin, we would totally get a sister act going in my bedroom.
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a feeling of total annoyance of the ingnorant ghetto wannabes around you
I feel totally sister act, those bageenies won't shut up.
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Changing a religious hymn/carol's lyrics and beat to make it groovier, as seen in the movie "The Sister Act"
"Pentatonix really pulled a Sister Act on us"