in someone's face

1. In front of or against someone directly, as in He slammed the door in her face. [First half of 1400s] Also see in the face of.

2. get in someone's face. Annoy or pester someone. For example, He's always getting in my face when I'm trying to meet a deadline. Closely related is the imperative, get out of my face, meaning "stop annoying me," as in Get out of my face before I punch you! [Slang; 1920s] Also see in your face; throw in someone's face.