you can easily form these by:
1 before pooping cover the toilet water with toilet paper. enough so it can withstain a gaint load.
2 then POOP POOP and POOP some more.
3 DO NOT FLUSH! thats the important part.
This makes it so the log you just left will poke out of the toilet and stink like shit
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").