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Siak is not the same as sial. It is an affirmative slang word that means "surely", typically used by younger millenials. It is not a curse word and it is not offensive, but for the sake of respecting the elders please avoid using this slang word. Other synonyms of siak are : siut, siot, seh These words are probably more famously used among Johoreans, Malaccans and Singaporeans.
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