If that is the case, would you, not knowing the meaning of a word, use that word in a professional environment? And also, does not understanding the meaning of the word excuse it's use?
I said he may have mistaken the meaning of the word. They don't have footnotes on porn sites deciphering milf, bdsm, cfnm etc. Sometimes we say silly things in foreign languages. And also in our mother tongues. It's not like we check every word we use in the dictionary.