Kakku means a cuckoo bird. The cuckoo bird is a lively bird with a sweet voice. But Kaku is far from these attributes. He used to cry at all times. During good-natured fun, he gets offended easily. Also, he is always in a foul mood. it seems like he is always angry with everybody and just ready to fight with anyone. All of these personality traits are nowhere near what his name stands for. This is the irony of the poet’s talking about..