snotty [snottier, snottiest](dirtied with snot) adjective [UK: ˈsnɒ.ti] [US: ˈsnɑː.ti]
mocosonoun {m}
brat [brats](a selfish, spoiled, or unruly child) noun [UK: bræt] [US: ˈbræt]You shouldn't allow your son to act like a selfish brat. = No deberías permitir que tu hijo se comporte como un mocoso engreído.