This song was sung by Narottama dāsa Ṭhākura, a great devotee-ācārya in the disciplic succession of Gauḍīya Vaiṣṇava sampradāya. Gauḍīya Vaiṣṇava sampradāya means the disciplic succession who are coming down from Lord Caitanya. So this Narottama dāsa Ṭhākura has written many songs, and it is recognized as a authority by all the Vaiṣṇavas. He has sung the songs in simple Bengali language, but the purport and the deep meaning of the song is very significant.
He says, gaurāṅga bolite habe pulaka-śarīra. This is the perfection of chanting, that as soon as we chant or take the name of Lord Gaurāṅga, who initiated the saṅkīrtana movement, at once there will be a shivering in the body. So it is not to be imitated