Search for -#crab in the search window, and all of the items hashtagged "crab" will be eliminated. It's not perfect, but it'll get you what you want: your Deals.Woot without all this crab bullsh*t. (You don't have the algorithm that pushes the best deals to the top. But you can get them through a combination of the "new" tab and the "votes" tab.)
. . . but before you do, take a moment to click on each of the deals with crabs and click tattle. Freaking flood Woot with tattles for these things. If they don't respect their customers enough to nip this crab crap in the bud when it begins, maybe their automated systems will.