Refers to the practice of receiving alcohol (particularly beer) after legal serving hours. Specifically a practice in Toronto, in Chinatown. Generic and common brand beer is served in a teapot, so as to avoid detection from the authorities
It's 3 am, you're drunk and want to keep drinking. Head to Spadina, wander around Chinatown, walk into New Po King and order cold tea. Molson Canadian gets served to you in a teapot.