noun · drawings, patterns, or writing scratched or painted on walls in public spaces

这里的围墙上布满了充满艺术气息的涂鸭。

a self-deprecating term used to refer to one's own unskilled writing or artwork

这是我的随笔涂鸭，还请各位多多指教。

to write or draw in a messy, careless, or aimless manner

弟弟在我的课本上到处乱涂鸭。