I had the word "tango" and my clue was "It takes dos to..." The word "two" wasn't allowed. I was buzzed and the opposing team said foreign words aren't allowed. My teammate even sided with them. I read the rules carefully and there is nothing that implies foreign words aren't allowed. They pretty much made up the rule. Thoughts?
Well, if you are playing with people who speak different languages then foreign words might be ok. But for regular games if you use foreign words that might be unfair on those who do not speak the language, and I think it would be wrong to use them also, unless you have a bilingual family etc where both languages would be fine.
Common sense however would suggest that if a word in banned in English then it is banned in any language, as that defeats the purpose of the game. It is a word description game, not a translation game so using a foreign word would be against the spirit of the game. This may well not be specified in the game, as it seems redundant to even need to put it down.