suffix, godan verb (-ru)
act like ...; pretend to be ...; put on airs of ...
Suffix attached to nouns, adjectival nouns, or adjective stems. Describes someone consciously or unconsciously behaving as if they have a certain quality. Often carries a negative or mocking tone.
彼はいつも偉そうにぶっている。
He always acts self-important.
彼女は上
She talks in a refined manner, but actually she's not that refined.
godan verb (-ru), intransitive verb
put on airs; act self-important
Colloquial intransitive use without a preceding word. Implies someone is acting superior or pretentious.
あいつは最近ぶってるよね。
That guy has been putting on airs lately, hasn't he?