onomatopoeia · making low sounds of physical pain, illness, or dissatisfaction

他感冒后一直躺在床上哼哼唧唧的。

onomatopoeia · speaking in an indistinct, low, or hesitant voice

他哼哼唧唧了半天，也没说清楚到底是怎么回事。

onomatopoeia · complaining in a repetitive or annoying manner

别在那儿哼哼唧唧了，快点去干活！