Gig pig
Gig, short for gigabyte, pigs are notorious for stealing all your gigabytes of shared data on your data share plan for both your smartphones. They usually sit at home wasting it on emulators and netflix, so by the time you try to download YOUR netflix movie, up goes your phone bill, courtesy of the gig pig.
My boyfriend is such a gig pig, I didn't even have enough data to download one single song!