Tahayya means determination

Ghalib, hamein na chhed ke phir josh-e-ashq se,
Baithe hain hum tahayya-e-toofaan kiye hue.

ग़ालिब हमें न छेड़ की फिर जोश-इ-अश्क से
बैठे हैं हम तहय्या-इ-तूफ़ान किये हुए

English translation:

Ghalib, tease us not again with the barrage of tears,
We sit here with a determination to take on the storms.

josh-e-ashq: a flood of tears; ashq is tears

tahayya-e-toofaan: determination to face storms; determination as strong as that of storms