Louchébem is Parisian and Lyonnaise butchers' ( Fr. boucher) back slang. It originated in the mid 19th century, similar to Pig latin and Verlan. First consonant is moved to the end; followed by suffixes such as -ème, -ji, -oc, -muche; the letter "L" is placed at the beginning of the new word. Note that spelling often becomes phoneticized.
le boucher; = Louchébem la femme = Lamfé le monsieur = Lesieum le gigôt = Ligogem le patron = Latronpuche le fou = Loufoque
Some words from Louchébem, most notably "loufoque" have become common and moved into everyday slang.