smacker

[smak-er] /ˈsmæk ər/
noun, Slang.
1.
a dollar.
Origin
1915-20, Americanism; smack2 + -er1
British Dictionary definitions for smacker

smacker

/ˈsmækə/
noun (slang)
1.
a loud kiss; smack
2.
a pound note or dollar bill
Word Origin and History for 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.

Slang definitions & phrases for smacker

smacker

noun
  1. (also smackeroo) A dollar; buck: having to cough up a thousand smackers/ That car's not worth a single smackeroo (entry form 1921+, variant 1940s+)
  2. A kiss; smack: Slip me a smacker, sister (1775+)

[the money sense, attested also of pesos and pounds sterling, may echo the slapping down of a bill on a counter, gambling table, etc, and hence be semantically related to plank and plunk for coins]