The phrase is Malay slang: kantoi means caught red-handed, and tak puasa means not fasting. During Ramadan, when many Malaysian and Indonesian Muslims fast from dawn to sunset, being caught eating or drinking becomes an easy, relatable joke, especially among friends and family. Short clips like this circulate on TikTok, WhatsApp and reaction videos each fasting month, where creators reuse the call-out over new footage rather than explaining it. Its humour depends on shared cultural knowledge, which is why it stays popular in Malay-speaking communities even outside Ramadan.