They're throwing out insults, maybe they're tickling each other, maybe they're making fun of each other, maybe they're making fun of themselves, and there's some aggression to it.

他们会说伤人的话，胳肢别人，取笑对方，取笑自己，而这些打闹是有一定的侵略性的。

耶鲁公开课 - 心理学导论课程节选