If you ask for a hammer, you will get a hammer, an Internet buzzword, which means that after a whistleblower broke some scandals, fans asked for evidence, so the whistleblower produced evidence and slapped the fans in the face. The "hammer" here refers to real hammer and evidence. This word comes from September 2017.
Real hammer, a popular Internet term, literally means a very full, real or very full hammer. The extended meaning is that the characterization of something can no longer be changed because something has the role of evidence.
For example, it refers to evidence such as text, pictures, voices, videos, etc. The entire matter has been concluded and can be announced once there is evidence. If a party issues a forged lawyer's letter, false solemn statement, etc., threatening or intimidating the audience and is later discovered, the party may be held criminally responsible according to law.
The real hammer first appeared in the cartoon "Comic Manga Hiyori".