Quite literally, this Indian slang (bordering on being abusive) means 'a dirty mother...!' It is an extension of Madarchod (meaning Motherfucker) and is an amalgamation of 'Madar' (mother) and Bhangi (dirty)
"Madarbhangi! Apni naak se ungli nikaal?!" Which means, "You dirty mother...! Take your finger out of your nostrils?!'