wad·dle 
(wŏdl)
(wŏdl)intr.v. wad·dled, wad·dling, wad·dles
1. To walk with short steps that tilt the body from side to side.
2. To walk heavily and clumsily with a pronounced sway.
n.
A swaying gait: the waddle of ducks.
[Frequentative of WADE.]
waddler n.