beschmieren
Beschmieren is a German verb meaning to smear or daub a surface with a substance such as paint, ink, grease, or dirt. The act is often conducted with the intention of marking, obscuring, or defacing the object. In common usage, beschmieren is closely associated with vandalism or graffiti on walls, windows, vehicles, or other property, but the term can apply to any surface that is smeared.
The noun Beschmierung denotes the act or result of smearing or defacement. A related verb form besmieren
Legal and social aspects: In many jurisdictions, beschmieren of another's property constitutes property damage or vandalism.