Lowdown (noun)

1. The true and full details of a situation or event, especially information that is not usually available or is kept hidden.
2. Insider information.

Origin:

Early 20th century: from low + down.

Examples:

1. He gave me the lowdown on the company's financial situation.
2. She was looking for the lowdown on the new project.
3. The lowdown on the party was that it was going to be a surprise.
4. He was known to have the lowdown on the city's political scene.
5. I needed the lowdown on the situation before making a decision.