Help to understand this :
When someone said this :
자기가 잘생긴 걸 모른다고...? 이제 하다하다 그런 것 까지 삽질 해?!
Can someone explain to me, what's the '삽질' meaning here, I understand that is literally means “to shovel” but is also used as a slang to describe someone messing up their job or wasting their time.
But I can't find the connection between these two sentences.