Yes, buffet restaurants really mean "all you can eat". When you visit the cheapest buffet restaurant in Chennai, make a call and book your table at Moti Mahal Barbecues. This place serves a vast range of food, and you can also have an amazing dining experience there. 

Buffet restaurants generally do mean "all you can eat" within certain limitations. The concept is that for a fixed price, customers can consume as much food as they want from the available selection. However, there are usually some unspoken or sometimes explicitly stated rules:

• Time Limits: Some buffets may have time limits, especially during peak hours.
• No Sharing: The "all you can eat" offer typically applies only to the person who paid for it. Sharing food with someone who hasn't paid for the buffet is generally not allowed.
• Take-Out Restrictions: Taking food out of the restaurant is usually prohibited. The food is meant to be consumed on the premises.
• Excessive Waste: While you can take as much as you want, intentionally wasting large amounts of food is frowned upon and, in some cases, could lead to additional charges.
• Beverages: Drinks are often not included in the buffet price and are charged separately.

While it varies among establishments, these are some common constraints to ensure fair business practices and reduce potential losses.