shinplaster

[shin-plas-ter, -plah-ster] /ˈʃɪnˌplæs tər, -ˌplɑ stər/
noun
1.
a plaster for the shin or leg.
2.
Informal.
  1. a piece of paper money of a denomination lower than one dollar.
  2. money of little value, as that issued on insufficient security.
Origin
1815-25, Americanism; shin1 + plaster
British Dictionary definitions for shinplaster

shinplaster

/ˈʃɪnˌplɑːstə/
noun
1.
(US & Canadian, Austral) a promissory note on brittle paper, issued by an individual
Word Origin
C19: so called because of its resemblance to a sticking plaster
Word Origin and History for shinplaster
n.

also shin-plaster, piece of paper soaked in vinegar and used to treat sore legs, from shin (n.) + plaster (n.). In U.S. history, jocularly or as a term of abuse for "devalued low-denomination paper currency" (1824).