A Transformers fan term for when a Transformer turns into something that couldn't physically possibly happen, say a 40 foot robot in to a tiny hand gun or tape recorder.
The fan (and later cannon) explanation is that this extra mass is "shifted" into subspace so the physics works.
The movie isn't going to do this, because it looks daft. Which is fair enough.
The character is still in the film, but is called Frenzy now rather than Soundwave. Soundwave has apparently been pushed back to a possible sequel.
Sigh. I had such hopes for this film. But they've essentially jetisoned anything and everything to do with Transformers save the character names, and the new designs are so, so ugly. Not just different, but very, very bad on their own merits.
Phazer