Louchébem

Louchébem or loucherbem (French pronunciation: ​[luʃebɛm]) is Parisian and Lyonnaise butchers' (French boucher) slang, similar to Pig Latin and Verlan. It originated in the mid-19th century and was in common use until the 1950s.

The louchébem word-creation process resembles that of largonji, verlan, and javanais, in that existing words are camouflaged according to a set of rules. Strictly speaking, louchébem is a more rigid variety of largonji in which the ending -èm is obligatory. Largonji substitutes ⟨l⟩ for the consonant or consonant cluster at the beginning of the word, or, if the word begins with an ⟨l⟩ or a vowel, the second syllable; the initial consonant is then reattached to the end of the word along with a suffix particular to the argot: -ji [ʒi], -oc [ɔk], -ic [ik], -uche [yʃ], -ès [ɛs], or in the case of louchébem, -em/ème [ɛm].

...
Wikipedia