Booger (noun)

1. A piece of nasal mucus that has been picked from the nose.
2. A dirty, usually dried piece of nasal mucus visible on the face.

Origin:

Slang term of uncertain origin, possibly from the old english word boggart, meaning a goblin or a bogeyman.

Examples:

1. He picked a booger from his nose and flicked it away.
2. She wiped the booger off her child's face.
3. He had a booger hanging from his nose while he was talking.
4. The child was playing with boogers and eating them.
5. He made a booger and flicked it on the wall.