Irish colloquialisms: "gombeen". A gombeen man is a pejorative Hiberno-English term used in Ireland for a shady, small-time "wheeler-dealer" businessman or politician who is always looking to make a quick profit, often at someone else's expense or through the acceptance of bribes. Its origin is the Irish word "gaimbín", meaning monetary interest. The term referred originally to a money-lender and became associated with those shopkeepers and merchants who exploited the starving during the Irish Famine by selling much-needed food and goods on credit at ruinous interest rates.

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To the travellers chances are you'll offend , best to stay your tongue. The only other group that gets offended by the word tinker is middle to upper class snobs who habitually censor speech and police behavior on behalf of minorities who never asked them to , don't need them too , and really rather that they wouldn't.
Regardless of what the word has become , traditionally it was similar to calling an electrician a "sparky" or a carpenter a "chippy" , you called a tin-smith a "tinker". It only became derogatory after the travellers lost their identity as tin smiths , with the mass production of goods and so on , that the word took on a mocking tone.