Wamble: Both a verb and noun meaning: 1. To move unsteadily; an unsteady motion. 2. To feel nauseated; a feeling of nausea. 3. (Of a stomach) To rumble or growl.
From the Middle English wamelen (to feel nausea), from the Indo-European root wem- (to vomit), the source of the words such as vomit and emetic.