Originally Posted by Swepples

Very possible, either hit both pecs and chest, or both pecs and neck.
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Here's an example. The key to getting boom hits are 2 things: Speed and ghosting.
Ghosting allows your tori to phase through ukes body parts, touching several joints at once. If you pause the replay on the frame before uke dismembers, you will see my foot inside of Ukes torso. The only way to get a good ghost in is having a high speed (For me, a speed around 50 seems pretty prime for boom hitting, use "/sm 1") and a lot of trial and error. Go frame by frame until it happens.