When trying to lose weight you are often told to "just stop eating" or "eat less, you fat pig" without being told how you can help yourself do that.
First you will have to shrink your stomach, which will be the hardest phase. Some things that can help are these:
Reduce your plate size. What worked for me was somewhere between a tea saucer and a dinner plate. About 6-7 inches across. This is purely psychological but can help immensely.
Chew each mouthful at least ten times. This accomplishes two things. Firstly it breaks the food down more which helps the digestion of food into your body and secondly it allows more time for the food to start registering in your system so you will feel full often before you finish your meal instead of still feeling hungry. Often it can take up to 15 minutes for this "full" feeling to register.
If you do feel hungry later and you had all your meals, fill a jug/bottle with water and take 4-6 big swills to fill yourself up.
These few tips helped me lose 40 kg once. Maybe they can work for you too.
I read the title as "How to eat ass" and thought /u/highlypairorgypro joined phuks...
Another tip is that what you eat can matter just as much or more than how much you eat. You can probably eat al the carrots, cauliflower, and beans that you want. It's a good way to feel full compared with eating chips.