I found this site that tries to give definitions for the slang words used in the trade. ie Peckerhead, cowboy, fish bit, etc.
Good if you are a newbie or, enven if you are an old timer, just expanding your knowledg of the trade. I think that they try to comment on the origins of some words.

http://www.tradeslang.com/

Thanks Ian, now I can understand what you guys are saying.

Ian A.