Tosa means
Srimad-Bhagavatam
SB Canto 4
Lord Śiva is also called Āśutoṣa. Āśu means "very soon," and toṣa means "to become satisfied."
SB 4.6.5, Purport: Lord Śiva is also called Āśutoṣa. Āśu means "very soon," and toṣa means "to become satisfied." The demigods were advised to go to Lord Śiva and beg his pardon, and because he is very easily pleased, it was certain that their purpose would be served. Lord Brahmā knew the mind of Lord Śiva very well, and he was confident that the demigods, who were offenders at his lotus feet, could mitigate their offenses by going to him and surrendering without reservation.