Khub khub Anumodana is a Jain expression meaning very heartfelt approval and joy.

• Anumodana (अनुमोदना) = assent, approval, or rejoicing in someone’s virtuous conduct.
• Khub khub = a strong intensifier meaning “very much” or “greatly.”

So, Khub khub Anumodana = “very great approval and rejoicing” in someone’s good deeds; it is a warm, public form of encouragement and happiness for another’s spiritual progress. This concept is used in Jain practice to uplift the community and foster virtuous conduct. You can read more here