Russian slang for performing sexual acts with your blood relative usually involving S&M, anal abuse, and drinking each other urine afterwards.
Nicholai: Ivana would you like to mik-e-ash in my bedroom?
Ivana: But I am your brother Nicholai!
Nicholai: But I know you love S&M and anal sex.
Ivana: Correct, I also love to drink Urine. Let's do it!