If something such as a person's stomach bulges, it sticks out.

If someone's eyes or veins are bulging, they seem to stick out a lot, often because the person is making a strong physical effort or is experiencing a strong emotion.

If you say that something is bulging with things, you are emphasizing that it is full of them.

Bulges are lumps that stick out from a surface which is otherwise flat or smooth.

If there is a bulge in something, there is a sudden large increase in it.