This is something I found while playing Wowcrack and I'm sure it would work on some other ascent servers. I'm also sure no one has figured this out because there aren't alot of Troll Priests :P.
With Touch of weakness bugged as hell, you might be able to take the quest from the Undercity Priest trainer to learn it. On wowcrack you can immiediatly complete the quest because its buggy as hell. When learnt, touch of weakness seems to reduce your dmg to 1 per hit, or miss. However, if you melee attack a beast type mob or use your wand, with touch of weakness activated on you, you do millions of damage.
This exploit is due to 2 things, touch of weakness not fully fixed and the fact that Trolls have a racial ability that does extra damage to beasts. I experimented with enchants like lesser elemental slaying but it won't work. This will only work on beasts QQ.
Anyways sorry havn't been able to find many good exploits :P Heres proof of me doing it.