I came across the word while looking at the following Chinese character:
- 弄(롱) tease; play
Here is how the character is described in Naver's Chinese character dictionary:
王(왕☞玉)과 이외의 글자 공(양손)의 합자(合字). 손에 구슬을 가지고 만지작 거린다는 뜻
Notice that the description uses 만지작거리다 to say the character represents "a hand holding and fingering gems (or beads)."