Verlan: French slang that inverses words
Another pecularity of French is the tendency to supercomposition.<p>Like the expression <i>au jour d'aujourd'hui</i> which means "the day of today", however, <i>aujourd'hui</i> itself mean "the day of today", because <i>hui</i> is the Old French word for "today" and <i>aujourd'</i> is obviously the concatenated form of "au jour de".<p>But it does not end there: the Old French word <i>hui</i> evolved from "hoc diem", which means "this day" in Latin.<p>At the end, the best explanation of <i>au jour d'aujourd'hui</i> is<p><pre><code>    (the-day-of
       (the-day-of 
         (this (day)))
</code></pre>
which is fascinating.