抹淡沫默落墨
[mŏ dàn mò mò luò mò]
It's a poetic creation by the user using homophones of Chinese words: the first two characters can also mean 'froth' (泡沫 mò) or 'lighter' (抹去 mó qù), which gives the whole term the artistic feel of 'lightly fading foam falling as ink'. Each character carries cultural meanings associated with transience, silence, and traditional art forms like calligraphy respectively.