wag·gle 
(wăgəl)
(wăgəl)v. wag·gled, wag·gling, wag·gles
v.tr.
To move (an attached part, for example) with short, quick motions: waggled her foot impatiently.
v.intr.
To move shakily; wobble: waggled down the steps.
n.
A wobbling motion.
[Middle English wagelen, frequentative of waggen; see WAG1.]
waggly adj.