Question: Someone once told me they were saying [güero](https://forvo.com/search/guero/es/) which sounds very different from what the Mexicans are saying.

Answer: 
Some more answers:

<http://www.urbandictionary.com/define.php?term=Wedo>
<http://www.spanishdict.com/answers/143985/how-do-you-spell-the-slang-word-for-white-guy-in-spanish-wedo>
<https://thedialect.wordpress.com/2009/06/26/wedo/>
<https://forum.wordreference.com/threads/wedo-g%C3%BCero.47551/>

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> Wedo’ was explained to me by my co-workers as ‘white skin guy’ and now, years later, I have determined that the proper spelling for it is güero with the dictionary definition being ‘blonde’ but used informally as ‘whitey’.
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Actually wedo is a derogatory term to describe either white people or mix breed white people. Loosely it's the same as being called a cracker or a honky.