The Slashiest Non-BL anime EVER!

[Yukinojo14]

Let's see:
Petshop of Horrors
Ouran High school host club
Godchild (Cain and Riff, Jizabel and Cassian)
Vampire Doll
Naruto
Prince of Tennis
Petshop of Horrors: Tokyo  

[The Flesh Failure]

Kuroshitsuji (Black Butler) all the way.

Gundam Wing, Fruits Basket, and FMA are very slashable also.  

[Von Ranke]

Crimson_Essence

I'd say Weiss Kreuz, lots of UST between the guys in that anime. I think there is anyway.

I'd second that. xp  

[poisonivy86]

Ouran high school host club & Kyou kara maou.

Two personal favorits too 3nodding  

[latitude_cat]

DRAGONBALL Z

 

[Jaaku-san]

Ookiku Furikabutte or, as many of the fans lovingly refer to it, Gaysball. A fairly realistic sports series about high school baseball where the anime is better than the manga. AbexMihashi is the most canon unofficial BL pairing you will ever find (Mihashi's the pitcher and Abe's the catcher) outside of the Ace Attorney games.  

[fire Foxe]

Yofiel

...Prince of TennisXD

I mean, come on, every second sentance ANYONE says in that anime is crawling with sexual innaudio.

"Show me your 'tennis'!"

"Aacha! It was a touch and go there for a second!"

"...Its not like you guys didnt go wild affter that..."
...goodness..O.o

"You're not going to take it lying down, are you Fujisaki Syouske?" There are a MILLION different ways this could have been phased to sound non-implying... XD

Aside from that, ANYTHING Ryoma says sounds implying because he always has that suggestive smile on his face O.o I swear, whoever made this show must have been an extreme Yaoi fan or something...

whee

O_O i thought i was the only one who saw it. woot  

[Skeeterpillar]

my entire life is based on Naruto slash.............
.
.
.
I phail at life....  

[Tomqueen]

Jaaku-san

AbexMihashi is the most canon unofficial BL pairing you will ever find (Mihashi's the pitcher and Abe's the catcher) outside of the Ace Attorney games.

I LOL'd. Just saying. xd

I second Petshop of Horrors. There actually are a few more-than-implied slashy moments in there >__>

But I'd have to say Hand Off! wins for me. I could have SWORN that Tatsuki had a canon crush on Kotarou. Yuuto has a male stalker, too. Not to mention that there is a decent amount of cross-dressing.
 

[Keme122]

I'll have to say DN Angel, Naruto, Tactics, and Saiyuki. Oh, I almost forgot the Get Backers  

[Bruce of House Banner]

I think....Naruto, followed by Death Note (LxLight is practically canon), Godchild, Tsubasa( KuroxFai is just so obvious!), Wallflower, D.N. Angel, Fushigi Yugi, Ouran Highschool Host Club, Saiyuki(SanzoxGoku!), Bleach, Ranma 1/2(slashable by nature lol), and YuYu Hakusho.  

[Erandir]

Ookiku Furikabutte aka Oofuri, aka Gayseball.

It's so full of random hand holding between pubescent boys, "I want to be your catcher/pitcher!" declarations, and lines like "If you stay with me you can feel good as often as you like". The constant likening of the pitcher/catcher relationship to marriage makes it impossible not to pair Abe and Mihashi.

And not to leave out Tajima's: "I forgot to masturbate yesterday! My p***s is gonna explode!"  

[SungJewel]

OHHS
Kuroshitsuji
DN Angel
Kyou Kara Maoh
Saiyuki...?
Diabolo
Tsubasa
GodChild
One of my ultimate favorites, Spiral  

[Pix51]

Kuroshitsuji because of scenes such as the right page here http://www.mangafox.com/manga/kuroshitsuji/v02/c008/2.html

and Katekyo Hitman Reborn for no reason in general other than the lack of female characters, and abundance of male ones who really want Tsuna. Oh, and the translation of the character song... eek  

[ninja_xox]

Pix51

Kuroshitsuji because of scenes such as the right page here http://www.mangafox.com/manga/kuroshitsuji/v02/c008/2.html

and Katekyo Hitman Reborn for no reason in general other than the lack of female characters, and abundance of male ones who really want Tsuna. Oh, and the translation of the character song... eek

agreed also ohhc and dn angel