squab (n.) Look up squab at Dictionary.com
1680s, "very young bird," earlier (1630s) "unformed, lumpish person" and used at various times for any sort of flabby mass from sea slugs to sofa cushions; probably from a Scandinavian word (cf. dialectal Swedish skvabb "loose or fat flesh," skvabba "fat woman"), from Proto-Germanic *(s)kwab- (cf. Old Prussian gawabo "toad," Old Church Slavonic zaba "frog").