“Jai jai nanda, jai jai badda” is a traditional Jain mangal‑ghosh (auspicious slogan).

In proper form it is usually: “Jai jai Nandā, jai jai Bhadrā.”

Meaning in simple words:

• “Jai jai” – victory, glory, repeated for emphasis (great joy/praise)
• “Nandā” – joy, inner bliss, spiritual happiness
• “Bhadrā” – auspiciousness, goodness, शुभता

So the sense is: > “May there be great victory to joy; may there be great victory to auspiciousness.”

Why it is said:

• In many Śvetāmbara Jain traditions this cry is used:

- During very auspicious spiritual events (like reading about Bhagwān Mahāvīr’s dīkṣā, big religious processions, etc.) - At the samādhi / kāl-dharm of sadhus–sādhvīs, as a way of celebrating their supreme spiritual achievement, not mourning in a worldly way.

• By shouting “Jai jai Nandā, Jai jai Bhadrā” Jains:

- Express joy for the soul’s spiritual progress. - Create an auspicious, uplifting atmosphere instead of one filled with grief. - Remind themselves that true joy and auspiciousness are in tyāg, tapa and dharma, not in worldly attachment.

In short: We say “jai jai nanda, jai jai badda” to celebrate spiritual joy and auspiciousness at holy moments, especially connected with great renunciation and the journey of the soul.