The answer to this riddle is the ‘opposite of’ two words taken from the following:
Sita’s brother Ravi lives a few thousand miles away, on the other side of the globe. He loves to compose Pallavis. Sita has a concert coming up, where she needs to sing a ‘funny’ Pallavi. She urgently calls her brother over Skype and learns this Pallavi: ‘Sādam Rasanjādam Tayir Sādam Uṇdāl Pasi Thīrumé’. They go back and forth for sometime. As her brother has to leave to catch a flight, she says bye to him and closes the call.
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Natabhairavi (Meḷa 20)
Nata – Not-a (opposite of) – bye – Ravi!