tittering

She loathed his sarcastic smirk and tittering laugh.

她讨厌他挖苦的嘲笑和吃吃的傻笑。

Is this film any more than an hour and a half of tittering at rude jokes?

这部电影不过是对着粗俗笑话吃吃傻笑一个半小时，不是吗？