If something is plastered to a surface, it is sticking to the surface.

If something or someone is plastered with a sticky substance, they are covered with it.

If a story or photograph is plastered all over the front page of a newspaper, it is given a lot of space on the page and made very noticeable.

If someone gets plastered, they get very drunk.

If someone's broken arm or leg is plastered, it has a hard cover of plaster of Paris around it to protect the broken bone while it is mending.