You do not need to use these words. You only need to recognize them so you know when to walk away.
This post focuses on recognition (so you don’t get offended) and cultural context (so you don’t accidentally insult someone). It does not encourage using these words. Lost in Translation: A Guide to Recognizing "Bad Words" in Sri Lanka (Sinhala & Tamil) By [Your Name]
Travel safe, speak kindly, and enjoy the curry. Disclaimer: Language is regional. What is mild in Negombo might be a death threat in Kandy. When in doubt, just say "Sorry" in English.
In Western culture, "Your mother" is a joke. In Sri Lanka, it is a reason for a mob beatdown. The Amma bond is sacred.