As defined by the Coxford Dictionary, "The moment when you're playing Viego, and you kill and become an enemy character, upon which you use said character to kill someone else"
Play Video (Go to 3:28 for the explanation although I do recommend watching the whole video)

Viego Jungle is quite boring and I know for a fact a lot of people can back me up on that. Top is not much better as you are usually laned against opponents that are just not fun to go against, you also can't apply much pressure to the rest of the map and you also can't gank or help your team that much but can also be ganked very easily due to how long the lane is. Mid is perfect as your opponents are a lot squishier and you can gank and pressure the rest of the map incredibly easily. Viego can sustain in lane and gank very well due to him being designed as a jungler.

Viego is also a champion that is always useful even when behind due to him being able to turn into anyone on the enemy team and getting their stats and items, so you remain useful no matter what.

Normal Viego will usually build along the lines of a bruiser to survive/sustain through damage and to stay alive as long as possible to kill someone but this is incredibly boring and you will likely die either way as late game most champs will destroy you. However, if you build crit chance then you will quickly get kills and be able to reset multiple times throughout fights and get the glorious Viego Moment.

At the start of the game you want to remain relatively safe while farming. Q is great to not only poke the enemy with but to also apply your mark so you heal and deal more damage, this is the best way to sustain in lane as it heals for quite a bit when you use it on minions. E will help you shove in wave as it gives you bonus attack speed and to roam with the invisibility and bonus movement speed.

Your goal for the rest of the game is to try and get as fed as possible and carry your team, although it doesn't entirely matter if you fall behind as all you need to do is turn into somebody on the enemy team and you will get their stats.

General Strategies And Tips

Blade of the Ruined King (Q) should be used to try and hit minions and enemies at the same time.
Spectral Maw (W) is great for setting kills and is also great to set up ganks for your jungler.
Harrowed Path (E) increases your attack speed significantly so use it to attack minions and enemies.
Heartbreaker (R) Can be used to get over walls and surprise enemies.
Knowing how to play heaps of characters will help you to kill enemies when you turn into someone. If you don't know how to play the person you are possessing, spam all your buttons and it will very likely work.

Precision

Press the attack will allow you to get some extra damage in, and will also help out in laning phase. The extra damage you get for a couple of seconds afterwards will also help in order to burst down your enemy.

As you will not have as much health as you would normally due to buying crit chance items, getting some health back after a kill can be the reason you survive teamfights and will allow you to keep snowballing your lead.

Bonus attack speed will let you burst even faster, especially when comboed with your crit chance.

Even more damage. When you reach mid/late game, your crit will be high enough so the damage will be insane.

Resolve

Thank you for taking your time to read this build, while it may look dumb and too far off-meta at first, I promise you this could be your key to finally get out of Bronze (and maybe into grandmaster/challenger). If you try this build then have fun being able to 1v9 every game but I do recommend hopping into a normal match before ranked just so you get the feel for it (or don't and trust yourself that you won't int.) Trust me if I can make this build work then literally anybody can make it work. Let me know how you go with the build and tell me if there are any suggestions that you have for making this build even more OP.