Oh gosh I've been using some of these words without even realising they were shortened verlan.
chèm <- moche (ugly), not to be confused with chanmé <- méchant (bad) (think bad motherfucker), whose ending can't affort to drop.
reuch <- cher (expensive), not to be understood as an anglicism for "rush".
You'd write it cheum (moche => cheu-mo => cheum')