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.
The act of becoming black out drunk and ordering random things on the internet, such as things on your Amazon wishlist, then receiving them later and recollecting who and how they were ordered.
Today I received a pair of shoes and some shirts in the mail, thinking I had a secret santa... in reality I secret santa'd myself by drunkenly ordering my amazon wishlist.