This is a method of exchanging gifts amongst a group of people. All members enter their name into a pot. Then each member draws a name. You buy a Christmas gift for the person whose name you've drawn. You're supposed to keep the name of person you've drawn secret: thus "secret" santa.
Due to 8 years of Bush regime rule, we are now too poor to buy each member of the family a gift, so we'll do secret santa this year.
A prank that involves dropping of deuce (poop) into the back part of toilet, so that everytime they flush, the water tank empties and the poop hits the open air greeting them with a stinky suprise to last the whole year round. ho ho ho...
I was at a cable job and the customer pissed me off so bad, I left them a secret santa in thier toilet.