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   Russian
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по серьёзкеstresses
sl., teen. legit (a shortened form of the word "legitimate": Legit thought we gonna die Shabe)
slang for serious (seriously + for real: -Like I said, I have no desire to harm you. -For serious? urbandictionary.com Shabe)
 Russian thesaurus
по-серьезке
inf. по-серьезному (very informal denghu)