The word wigglewaggling doesn't appear to have a ton of synonyms, but some similar words might capture a similar concept. For example, undulating, waving, or oscillating could all describe a back-and-forth motion that might be similar to the wiggling or wagging implied by wigglewaggling. Other words that might come close in meaning could include quivering, shimmying, or jigging - all of which describe some kind of motion or movement that's less smooth and controlled than a simple straight line. Ultimately, though, the unique cadence and feeling implied by the word wigglewaggling might be hard to replicate with a direct synonym.