A murderer of another person's swag. This, concurrently, increases the swag of the swag assassin. In addition, if someone in the general area is misusing or abusing their swag, it is the job of the swag assassin to take over their swag. Also, a swag assassin's swag may be so great, that it shuts out everyone else's swag in the general area.
1. Paul's swag was all out of whack last night. I had to turn into the swag assassin
2. Hold on to your swag, the swag assassin is in the building.