Maremma is a geographical region between Southern Tuscany and Northern Latium.
Maiala means whore / slut.
Bucaiola (buhaiola with the gorgia) is a Tuscan (I think especially Florentine) swear meaning (yet again) whore / slut but also bastard / bitch.
Anyway you can also leave bucaiola out and just say maremma maiala.
The meaning is again something like fuck! / shit!