Hhhhh
【哈哈哈哈】
in text is how laughter is expressed in Chinese. Chinese people write it both ways “哈哈哈” or “hhhh” , but it can be read as “hahahahaha”
EXAMPLE:
Person A: You want to go out to KTV tonight?
Person B: I cannot, I am an tonight I am overtime dog
Person A: hhhhh, have fun
Read here for more popular Chinese slang!