An ill-mannered lout. The cub of a bear is said to have no shape until its dam has licked it into form.
A bear's a savage beast, of all Most ugly and unnatural; Whelped without form until the dam Has licked it into shape and frame.
Butler: Hudibras, i. 3.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894