French: "with juice". For non-francophones, the pronunciation is close to "oh zhoo". Refers to the cup of meat juices that are served alongside some meat dishes (best known with a French dip sandwich).
Often misused on menus in the form "...served with au jus". The English "with" is redundant, as the term refers to the fact that the juices are being served alongside (as opposed to being discarded), and not to the juices themselves.