What is Office Santa?
1.
Sarcastic way of describing a person who, usually during the winter at the height of cold and flu season, comes into work sick as a dog and "spreads the wealth around", like Santa Claus.
Try not to get too close to Jack for the next few days. He's the office Santa, spreading his damn flu to everybody. Doesn't his boss realize that we're losing productivity because he's making everyone sick?!
See