The Brief: Stronk is the Slavic/Russian or Eastern European pronunciation of "strong."

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Stronk is an intentional misspelling of the word “strong,” according to Wiktionary. In some cases, it is used to humorously evoke a Slavic/Russian or Eastern European pronunciation or accent. It is also used to mock something brutish or powerful that is of Eastern European/Russian origin, but not always.
STRONK MONKE from memes