Completed work, albeit completed poorly due to nonchalance, intentional lack of attention to detail, or by person just not giving a sh!t.
Occasionally, slacktivity can lead to being relieved of a duty that said person might not want to be doing anyway, when used strategically.
Coworker B: Yep. It's Jeff's week on kitchen duty. He is a master of slacktivity.
Coworker A: FORGET IT. I'll just do the kitchen stuff on his weeks.