I have heard the following sentence in the TV series Marseille:
Ça y est, nous avons reglé nos comptes, on peut se checker maintenant.
Context: a neighborhood gang leader has blown up the car of a guy which lives in the neighborhood as punishment because the guy had refused to make him a favor. They meet in the next day in a building and the gangster says the sentence above.
https://www.linternaute.fr/dictionnaire/fr/definition/checker/ says that "checker" is an anglicanism which means "to check". However, nobody says "we can check ourselves now" in English, so I assume that this expression is a French-specific slang. What does it mean?