I just want to start out by saying that I'm not a veteran LoL player yet, but through trial and error I've developed this WW build since I was summoner level 15 and have yet to not do well with it. I am very open to constructive criticism so feel free to comment as you like and I'll weigh the pros and cons and maybe change things if I'm enlightened by one.

I call this a hybrid build because it utilizes AD and a lot of proc magic damage. This will all be explained later in the Items section.

Greater Mark of Desolation x 9
Greater Seal of Malice x 9
Greater Glyph of Alacrity x 9
Greater Quintessence of Desolation x 3

Start with cloth armor and health pots x3 for jungling. After your first jungle circuit you should be able to buy a Madred's Razor and Boots of Speed. Then work towards getting your full Madred's Bloodrazor. After that work towards Malady. With Malady you'll have sufficient AS for now so you can get whatever boots you like. When build is finished you'll be very close to AS cap so I usually skip the Serker boots for either Boots of Mobility, Boots of Swiftness, or Sorc Boots (for magic dmg procs). Next get the Sword of the Divine. This item is when you start killing heros like crazy. At this point you have insane AS, and you're procing a lot of magic damage between Bloodrazor, Malady, and SotD. Now start working on Infinity Edge for the boost in AD and obviously amazing increase in crit damage. Finish up with either Black Cleaver or Phantom Dancer. Both of these items will increase AS to right under or over cap respectively. I usually choose cleaver because of armor pen proc and increase to AD, but crit % and movement speed from Phantom Dancer is nice as well. With full build you will be a force to be reckoned with and almost impossible to solo.

Smite for obvious reasons.... Can't jungle efficiently without it.

Exhaust to help with early game ganking and never hurts to have for late game ganking and team fights.

I love using this build because most people have not seen it before and wonder what the hell I'm doing, until I start soloing pretty much anyone and everyone. All I'm saying is try the build before you knock it. It is slow to start, but once you get the SotD you will not be unhappy with the build. Enjoy! :)

I know this build is rather short, but I'm hoping people try it out and give me feedback so I can add more. If there is anything anyone wants me to elaborate on or add to the guide as far as what I like to do for like jungling, ganking, etc etc, just ask and I'll add what I can.