The "в" preposition is missed. It must be "еби свою маму в задницу".
Sorry, I don't speak a lick of Russian...Hey, what did she say?Something like, "Kiss your mother's cute ass"...Dogegen Chonenger-san who just happened to be in Japan.Kon☆...? No, rather, a Ka☆☆n Kujou cosplay would fit her better...Fuck your mother in the ass
The "in" is missing, but the grammar mistakes are way, way worse