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Ply with fishheads?

Posted by ESC on April 15, 2003

In Reply to: Extra credit, please help posted by Misty on April 14, 2003

: I have a professor who has offered two much needed points for the student who can find the origings of the phrase "to ply with fish heads". Is there any one out there who can tell me this, I would so appreciate it.
: Misty

I couldn't find anything. Could you give us a clue or two? Is this a British, American or other phrase?