Hearing that noise the serpent-king immediately issued out—whose eyes were coppery and hoods were flaming with deadly venom. He was encircled by many other powerful and poisonous snakes living upon air and hundreds of serpent-nymphs adorned with rich ornaments, whose earrings glittered with brilliance as the wearers moved along. Coiling themselves around Krishna, they all bit him with teeth from which fiery poison came out.

In plain words: Hearing the noise, the serpent king Kaliya comes out with copper-red eyes and hoods flaming with venom. Many other poisonous snakes and richly adorned serpent-women come with him. They wrap around Krishna and bite him with fiery, poisonous fangs.