What is the Kama-gayatri?

In Caitanya-siksamrta 7/7, Srila Bhaktivinoda writes “Gayatri, the mother of the Vedas, became a gopi, attained the shelter of Krsna, and thus became known as Kama-gayatri. By the will of Krsna, YOGMAYA, the Lord’s spiritual potency has arranged the Vraja pastimes. These pastimes are totally faultless, because they are arranged by YOGAMAYA, not the Lord’s illusory energy. In these pastimes, Krsna’s eternally perfect maidservants, enjoy with Him. Demigoddesses and the personifications of the Upanisads and Gayatri, after attaining the association of Krsna’s eternally liberated maidservants, serve Krsna in Parayakiya-bhava (paramour relationship).” (from Sri Bhaktivnoda Vani Vaibhava, translated by Bhumupati dasa).