Correct

哼哼

/ hēng hēng /
Strokes

Example

As an Onomatope

groan; snort

1
Féizhū
肥猪
hēnghēng
哼哼
  
,
shòu
zhū
hēnghēng
哼哼
  

Both fat pigs and lean ones are snorting.—Everyone is complaining, whether they are well off or badly off or whether they have cause or not.

2
tíng
不停
hēnghēng
哼哼

keep groaning