The phrase is derived, not from the position of premium bottles in liquor stores, but their position behind bars. (as opposed to "well" liquors, which are stored in the bartender's speedrack well, and "call" liquors, which are popular but not displayed (and which must be "called").
While one person is taking a shit, he/she spreads his/her legs apart while on the toilet and allows another person to sit on their lap and shit into the same toilet.
Dude, I had to shit so bad and Eric was already on the pot so we pulled a elf on the shelf.
The act of telling people off that consistently misspell words in their statuses and in other aspects of life. The "your" can be substituted with "them" when the action is towards someone else or to "my" when regarding yourself (or your shelf). The "shelf" is supposed to "self" in proper English. Can also be used as FMS, FYS or FTS as abbreviations.
For the fact that you always misspell on Facebook, you can go fuck your shelf!
The best of the best. Usually refers to where wine or liquor are kept in a specialty liquor store. The beststuff is kept at the top for display until someone needs it.