Point-Blank means: To explicitly address an issue in a blunt, direct manner, without softening the speech or using subtlety.
You can use the idiom 'point-blank' to describe a very direct style of speech.
Example of use: That girl doesn't leave any room for misinterpretation: when Danny asked her out on a date, she said "no", point-blank.
The origin of this word goes back to French archery terminology in the Late Middle Ages. Back then, archery targets were usually white. Point was used as a verb and blank (taken from the French word for white, 'blanc') meant 'pointing at the target'.