What is a 'spitting image' ?
A precise resemblance, especially in closely related persons. For example, Dirk is the spitting image of his grandfather. This idiom alludes to the earlier use of the noun spit for "likeness," in turn probably derived from an old proverb, "as like as one as if he had been spit out of his mouth" (c. 1400). The current idiom dates from about 1900.
A perfect likeness or counterpart.
Probably from alteration of spitten, dialectal past participle of spit, the close resemblance of one person to another being likened in folk sayings to the former person having been spat out of the latter's mouth.
One exactly resembling another: double, duplicate, image, picture, portrait. Slang ringer.