妈卖批

(vulgar) your mom's a prostitute (from Sichuan pronunciation of 媽賣屄|妈卖屄[ma1 mai4 bi1])

ma / mom / mother

to sell / to betray / to spare no effort / to show off or flaunt

to ascertain / to act on / to criticize / to pass on / classifier for batches, lots, military flights / tier (for the ranking of universities and colleges)