A sexually impotent person, combining naff and binder; a bad screw; a lousy lay.
"I heard about you, you naffbinder, you don't go two minutes!"
An unsavoury person, one who particularly does not rinse after a toilet visit, often seen to wipe his fingers on his trousers when returning to the bar.
"He's a right pissfinger, never heard of soap."
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