How to farm non-respawnable bosses (Pre Respawnable bosses patch - Xbox 360)

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I'm trying to farm the Even-More-Disgusting Tork for a flakker but I've heard that he is non-respawnable. However, I've seen people get it anyway without the grinder. So how do people farm these non-respawnable bosses? I'm an Xbox-360 user. I've also heard about this dashboarding thing but I don't know how to use that either.
(I can't download the patch that make them respawnable)
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Images: James Wheeler, Zen Chung, Zen Chung, Zen Chung