In its noun form, a boss is defined as a person who manages others and makes decisions, the person empowered within a company to have authority over others. As a noun, boss itself is not all that bad. There are good bosses and bad bosses, but most would agree an organization with no one in charge would be chaos. That doesn’t stop people from complaining though!
“That One Boss” is, well, that one boss that falls victim to poor playtesting or was thrown in by especially cruel developers. You're leveling up normally, plowing through every battle, until you reach this particular battle and suddenly meet a nasty road block. Eventually, you Rage Quit, or you go on the Internet looking for assistance. In the event that you stop by the game's message board, lo and behold, everyone else is having the exact same problem, with entire topics asking "how do I beat That One Boss?". Walkthroughs usually list the worst offenders as "the hardest boss in the game", and eventually, such a beast receives a reputation for being just that freaking hard. A few of them may be awesome, but that still doesn't mean you won't be chewing on the controller in frustration despite it.
In business, the CEO is the highest-ranking officer while a president is the second-highest ranked officer. Depending on the company, however, there may be differences between how the roles are handled and the same person may also hold both CEO and president positions which means they'd be their own boss. Or something.
Hugo Boss AG, often styled as BOSS, is a German luxury fashion house headquartered in Metzingen, Baden-Württemberg, Germany, Europe. The company sells clothing, accessories, footwear, and fragrances. The company produced shirts and jackets and later work clothing, sportswear, and raincoats. In the 1930s, it produced uniforms for the SA, the SS, the Hitler Youth, the postal service, the national railroad, and later the Wehrmacht.