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1 definition by Praeteranimus

 
1.
n. pl. Money, especially paper currency; bank notes; American dollars, i.e. Federal Reserve Notes (any denomination), etc.

Big or large heads indicates a larger denomination.
A lemonhead refers to a known counterfeit.

The word refers to the common appearance of a famous statesman's head (e.g. George Washington on the one-dollar bill, Benjamin Franklin on the hundred-dollar bill, etc.) illustrated on the front face of the note.
I keep a bunch of heads in my wallet. You could call me Perseus.
by Praeteranimus June 07, 2011