4 sentences

1. 你傻笑什么啊？

   nǐ shǎ​xiào shén​me a?

   What are you smirking at?

   Source: OpenSubtitles

2. 他一个人盯着手机屏幕，在那儿嘿嘿傻笑。

   tā yī gè rén dīng zhe shǒu​jī píng​mù, zài nà​r hēi​hēi shǎ​xiào.

   He was staring at his phone screen, giggling foolishly to himself.

   Source: Dong Chinese Dictionary

3. 她整天没心没肺地傻笑，好像从来没有烦恼。

   tā zhěng​tiān méi​xīn​méi​fèi de shǎ​xiào, hǎo​xiàng cóng​lái méi​yǒu fán​nǎo.

   She giggles lightheartedly all day, as if she doesn't have a care in the world.

   Source: Dong Chinese Dictionary

4. 面对老师的询问，他只是不好意思地傻笑。

   miàn​duì lǎo​shī de xún​wèn, tā zhǐ​shì bù​hǎo​yì​si de shǎ​xiào.

   He just giggled sheepishly when the teacher questioned him.

   Source: Dong Chinese Dictionary