Etymology
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smacker (n.)

"money," c. 1918, American English slang, perhaps from smack (v.1) on notion of something "smacked" into the palm of the hand. Extended form smackeroo is attested from 1939.

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Definitions of smacker

smacker (n.)
a loud kiss;
smacker (n.)
a very powerful blow with the fist;
From wordnet.princeton.edu