М-22

КАК (БУДТО, СЛОВНО, ТОЧНО) МАМАЙ ПРОШЁЛ highly coll (как etc + VP subj. these forms only fixed WO

there is complete disorder, terrible devastation (in some place)

itfs as if an army had marched through (some place)

(some place) looks like a war zone (it's) complete havoc (in some place) (some place) looks as if (like) it's been hit (struck) by a tornado.

From the name of the Tartar khan Mamai, who led a devastating invasion of Russia in the 14th cent.