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Slut Sis Sunday

A day when you can fuck your slutty sister.
I didn't break any laws bc I fucked her on Slut Sis Sunday!
by SkinnyBoner69 January 20, 2020
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Sis

South African slang meaning, gross or disgusting or shameful.
Ag no SIS , that guy is picking his nose!!
by kz22x February 4, 2022
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