Absent of brassiere. Can be an expression of pride in perkiness or an excuse not to leave the house.
Damn! That dress looks great - how do you hide your bra lines?
- I'm free boobing, chica, no bra lines for me!
Hey - do you want to come and see my nephew's band play at the community centre?
- Aw, I'm sorry chica, free boobing today, I'm not leaving the house unless the gestapo show up.