Obviously (and not unreasonably), the opposite of bawbaggery. A good description is the antonym of bawbaggery, sackage. This "non"-definition exists mainly as a sarcastic play on words. Rather than using a positive word, the user mocks the negativity, by adding the prefix "not". Often, this phrase is a act of defiance towards the officious, annoying idiots that conspire to make life awkward.
"The local authority overturned the parking ticket some bawbag put on the ambulance when we stopped for bacon rolls, that's not bawbaggery!"