godan verb (-ru), intransitive verb
act tough; act bad; pretend to be worse than one is
Describes someone putting on a tough or delinquent front, often when they are not really that way. Used for people, especially teenagers or young adults, trying to appear cooler or more rebellious than they actually are.
彼はクラスメートの前で悪ぶっているけど、本当は優しいんだ。
He acts tough in front of his classmates, but he's actually kind.
悪
There are junior high school students who smoke to look bad.