tasyā upavane kāmaḿ
cārayantaḥ paśūn nṛpa
kṛṣṇa-rāmāv upāgamya
kṣudh-ārtā idam abravan
tasyah -- along the Yamuna; upavane -- within a small forest; kamam -- here and there, as they wished; carayantah -- tending; pasun -- the animals; nripa -- O King; krishna-ramau -- Lord Krishna and Lord Rama; upagamya -- approaching; kshut-artah -- disturbed by hunger; idam -- this; abruvan -- they (the cowherd boys) said.
Srila Jiva Gosvami explains that the cowherd boys were concerned that Krishna would be hungry, and thus they feigned their own hunger so that Krishna and Balarama would make suitable arrangements to eat.
Thus end the purports of the humble servants of His Divine Grace A . C. Bhaktivedanta Swami Prabhupada to the Tenth Canto, Twenty-second Chapter, of the Srimad-Bhagavatam, entitled "Krishna Steals the Garments of the Unmarried Gopis."