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1 definition by
Robert Crumballs
sister act
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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.
by
Robert Crumballs
May 12, 2005
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sister act
mug.