Question: What do these mantras mean?
Answer: GAURANGA means He whose body is more beautiful than molten gold, describing the form of the Supreme Lord.
HARIBOL means Chant the names of God, Chant the Holy Names!
NITAI means eternal, GAUR means golden.
GOPALA and GOVINDA are somewhat similar in meaning. Gopala is referring to the protector of the cows. Govinda means the Giver of spiritual happiness to the Brahmans, cows and the senses. RAMA means He who gives transcendental pleasure to those who lovingly serve Him.
MADANA-MOHANA means He who is so attractive that He attracts Cupid.
So they all are describing the very wonderful nature and qualities of the Supreme Lord.