All I can say is that day to day, you must be speaking to different Thais than I am. Chai&#x2F;mai-chai are only used - again, I must stress, by the 10-50 Thais I speak to in Thai each day - to mean &quot;correct&quot; or &quot;incorrect&quot;.<p>Where in Thailand do you live, and what level of Thai fluency do you have that you&#x27;re running in to frequent counter-examples?