Merriam-Webster Collegiate Dictionary - wamble

 I. intransitive verb  (~d; wambling)  Etymology: Middle English wamlen; akin to Danish vamle to become nauseated, Latin vomere to vomit — more at vomit  Date: 14th century  1.  a. to feel nausea  b. of a stomach rumble 1  2. to move unsteadily or with a weaving or rolling motion  II. noun  Date: 1552  1. a wambling especially of the stomach  2. a reeling or staggering gait or movement