A person who operates a computer or some system on behalf of somebody else.
(from the old Irish puck for push, punch or strike)
In world War II, pucksters would push wooden blocks across large War Room maps to show where units were on the battlefield.
a name you call a close friend who is being somewhat bothersome or really annoying. Instead of calling them a prick to soften the blow, you call them a prickster, a diminutive of prick.
Adrian: "Seriously, Blair's being such a prickster ever since she moved in. She always complains about how I leave the toilet seat up. Cut me a break, shit."