It's an outline of a persons face with a very large nose, that is poking through a crack in a door. The person is in the middle of walking in on someone.
This Butting In icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,100 icons, all in the same style and quality.