I've never heard foo-paus, but I have heard faux pas:
A faux pas (pronounced /ˌfoʊˈpɑː/, plural: faux pas /ˌfoʊˈpɑː(z)/) is a violation of accepted, although unwritten, social rules. Faux pas vary widely from culture to culture and what is considered good manners in one culture can be considered a faux pas in another. For example, in English-speaking Western countries, it is sometimes considered a thoughtful gesture to bring a bottle of wine when going to someone's house for dinner. In France, however, if the dinner is a bit formal, this is considered insulting as it suggests the hosts are unable to provide their own good wine. To bring wine to the home of teetotalers might suggest ignorance, obstinacy, or ill intent.