Johnny Vegas Syndrome means in slang: Leaders of all sexes, races, and sizes are affected by this crippling disorder. It usually follows a huge success, triumph, sale, etc. Exaggerated swagger and metaphorical swinging in chains are some of the symptoms. Rat Pack screensavers may also be present. You may feel inflated and unworthy of your abilities. (in Slang Dictionary, added by Gustavo Santos)