To roll; tumble
"The child walt down the steep hill on his sled."
unsteady; crank
"His walt seemed to be caused by too much coffee and not enough sleep."
A diminutive of the male given name Walter.
"Walt always greeted his neighbors with a warm smile when he returned from his morning walk."
Walt is simply a shortened form of the name Walter. In Britain, it became an insulting nickname for someone like the fictional character Walter Mitty: a timid person with grandiose daydreams.