A mark refers to a target or intended victim. It is typically used in reference to the target of a huster, hitman, or the like.
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The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
There aren't slang terms for people's names.
does a Finn in slang money terms mean "five"?
The original punter was someone who 'poled' a flat bottom boat for relaxation on English rivers. After WW2 it was a Cockney slang word for people with money to be fleeced. -In American terms, -a 'mark'
pansy, girl, wuss