Packing up, shacking up is all you wanna do

[Villavic]

I know this has been discussed, but I want to know sure about the meaning of Packing up, shacking up is all you wanna do

Stevie was upset with this quote. Dreams was positive but GYOW no, she said, and this quote offended her. Though she did sing it anyway, during the gigs.

But what does it mean? (remember I'm spanish speaking). I heard it means like she only wanted to have fun and didn't take seriously the relationship, is that correct?