If someone says "ponsikou" to you, it's best to politely ask them to clarify what they mean. You could say:
* "Maaf, apa maksud 'ponsikou'?" (Excuse me, what does "ponsikou" mean?)
* "Sori, aku tak faham. Boleh kau ulangi?" (Sorry, I don't understand. Can you repeat?)
* "Boleh kau cakap perlahan-lahan?" (Can you speak slowly?)
This will help you understand what they are trying to communicate and give you the opportunity to respond appropriately.