Rkgk

Synonyms:	rakugaki (落書き), 낙서
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rkgk (落書き) is a Japanese term "translated to scribble or graffiti from Japanese. On social media, it’s used as a hashtag for doodles.". Commonly seen on Twitter by Japanese artists art.

Another definition from urban dictionary:

Definition: To do a task quickly and with minimal effort, but not necessarily sloppily.

Urban Dictionary