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A very harsh insult in Russian thrown at members of another ''bratva'' (gang) or generally your opponent before a fight. It means "to fuck sb in mouth'' NOT the same as oral sex as it's done with consent by both parties, in this case you stress that you use your opponents mouth to pleasure yourself and he can do nothing about that...
Ya tvoi rot ebal, blyad!

(I fuck your mouth, whore)
by ansons September 25, 2011