The interjection 嘿
An interjection (感叹词) is a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reaction. It expresses feelings and emotions but does not name them. It is usually placed at the beginning of a sentence.
The interjection 嘿 
is used :
1) to attract attention, it’s often used to call somebody over. It can be translated as “hey!”.
is used :
1) to attract attention, it’s often used to call somebody over. It can be translated as “hey!”.Examples
嘿，伙子，到这儿来！
Hey, kid, come here!
hēi, xiǎohuǒzi, dào zhèr lái
嘿，陈先生，快走吧
Hey, Mr. Chen, let's go quickly!
hēi, chén xiānshēng, kuài zǒu ba
嘿！请不要践踏草皮！
Hey! Please don't trample on the grass!
hēi! qǐng bú yào jiàntà cǎopí
2) to express pleasure or satisfaction. It can be translated as “yay”.
Examples
嘿，这个太好了
Yay! This is great!
hēi, zhè ge tài hǎo le
嘿，我被大学考入了！
Yay, I got into university!
hēi, wǒ bèi dàxué kǎorù le
3) to express surprise, regret or annoyance. It can be translated as “eh”, “ah”.
Examples
嘿！下雨了！
Ah, it's raining!
hēi! xià yǔ le
嘿！这是什么意思？
Ah, what do you mean?
hēi! zhè shì shénme yìsi
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