words or drawings, especially humorous, rude, or political, on walls, doors, etc. in public places
The subway walls are covered with graffiti.过街地道的墙上满是涂鸦。
A man was jet-washing grafitti off his front door.
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If you asked him he'd say grafitti are much less considered than the marks he makes.
Graffiti was daubed on the walls.
The memorial to dead soldiers had been defaced by grafitti.
That graffiti is usually comissioned by the owner of the premises in an attempt to prevent their shopfronts being "tagged" with something they are not happy with.