The act of being a bawbag or a complete dick.
Never a nice person, always someone that you'd like to see get said baws kicked baws being balls. So a bawbag is a scumbag. But the act of bawbaggery is walking about acting like a bawbag. Generally annoying the whole population.
Me: There that wee bawbag has just stole that wee guys bike
Mate: Ho bawbag give that wean his bike back
Us: That was just a pure bawbaggery act there, wee bawbag.
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 localauthority overturned the parking ticket some bawbag put on the ambulance when we stopped for bacon rolls, that's not bawbaggery!"