Well! "toughie fiddlesticks - why the hell should i use that?" - you say? well. because you won't be the first target in early / midgame, allowing you to rack up some kills and money before the crucial lategame. When you are in lategame, your prox 3000 hp will allow you to ult in on top of your enemies (Use flash to correct for their movement), use ghost, and run for 6 seconds with your enemies, dealing heavy damage to all the enemies. Your high hp and spell vamp will let you survive way better, and in some games, do your ult as a solo maneuver (alone), taking out and heavily damaging the enemy.

Okay. Some very important points about these items:

* Starting item - get another item if you don't like my suggestion (it's to build catalyst). you'll have to change it to your own style. I suggest having a mana pot. perhaps also a health pot to use in case you're stuck at the tower, with low hp, and don't want to spend mana on draining units that are getting killed by the tower. Everything can happen.

* Magic Pen - 38.55 (remember to add 10 from dread) magic pen at the top? might seem like overkill, but it allows you to essentially deal almost true damage to many champs that haven't gotten magic resist.

* Ability power - Only ~450 AP??? that's not nearly enough! Well... there's an error in the calculation. it's actually 602.342 AP you get out of it (As far as i can count). But it's not really a big amount, i know it. Feel free to change the hextech revolver (or the will of the ancients if you don't like support, or S vamp at all) to a mejai's or another high-AP item. The Mejai's is actually highly recommended if you're having a good game, as the cooldown reduction could come in handy when snapping out of an interrupt.

I'm sure it can be done. Fiddle is an easy char to jungle with. I suggest consulting another guide for that, as i'm not really a big fan of it. (I prefer others, when i want to jungle)

I have tested this in 5v5 with the game usually ending before the build is finished. I'm not sure about 3v3 though. my bet is that it does even better there, as high hp is a well-liked trait.

(Assuming you play in a co-op lane)

Early game:

It would be ideal to lane with a champion with some CC, but that's what everyone want to lane with. no, instead lane with either of these two choices: A low-hp champ (preferably not in your arranged team ;D) that takes the aggro of the opposing laners, as that person seems easier to kill.
or a high hp champ that can back you up with a terrifying presence.

Live by Fiddlesticks' creed in the early game: "Fear me!" Make the enemy laners truly fear you, and punish them harshly if they ever overextend, or ever believe that they can approach you. Keep your mana supply high. (possibly with a laning champ with clarity?)

Mid game:

Get Rylai's as quickly as you can. you need it to succesfully pounce enemies with crowstorm. Stray from your lane, and gank everywhere you can, ulting, flashing to your enemies position, and ghostrunning with them. if only one's left, terrify that person, and start draining. This will stack your mejai's heavily if you go for that option.

Late game:

This phase is very hard to plan. but you should attempt to be a nuke at this stage. use your ult to damage most of the enemy's team, and then sling out a dark wind to silence all of them, gorge upon a carry with your drain. this will create enough havoc, slow and damage to let the rest of your team get into the fray and pick off the essential enemies. This build will allow you to be an initiator. you can tank the tower for some shots, and heal yourself up afterwards, and continue pushing or killing, whatever takes your fancy.

Toughie fiddlesticks is made for his ability to use crowstorm, and getting the most out of the damage it does.

Toughie fiddlesticks is also a very good initiator. Cracking the enemy team wide open with multi-target nukes, and able to tank a tower shot or two.

Toughie fiddlesticks is a bit controversial, and it's a good idea to change it to suit your style.

And remember! Wish your own and the opposing team good luck, and the ability to have fun.
It's just a game, and we're all here to enjoy ourselves.