Depending on the tone/context in which it is used it can mean a girl is into you, is using you (usually for money) or she wants your quivering member.
Dude she just wants your pennies (in it for the money)
Dude I think she wants your pennies (shes digging you)
Dude she wants the pennies (with more emphasis on the i in pennies meaning she wants your dong).
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