Correct

嘻嘻哈哈

/ xīxī hāhā /
Strokes

Example

As an Adjective

laughing and joking; laughing merrily; mirthful; noisily cheerful

1
men
我们
bàngōngshì
办公室
de
rén
chéngtiān
成天
dōu
嘻嘻哈哈
de
  

There is always a lot of joking and laughter in our office.

As an Adjective

not very serious or earnest about; facetious

2
Tàn
xué
yùndòng
运动
bu
shì
嘻嘻哈哈
nàozhāowán
闹着玩
de
  

It is no joke to go spelunking.

3
Zhèngjīngshì
正经事
bu
néng
嘻嘻哈哈
  

We mustn't joke about serious matters. / Don't be facetious about serious matters.