How you do you say "What is this word?" in a friendly, indirect and elaborate way?
In a similar spirit to ça se mange?, some people in the UK (especially my parents) would say "that's easy for you to say". This refers to a 1970s comedy TV show, the Morecambe and Wise Show, but most people would understand the joke even if they hadn't heard it before.
It isn't common here in Australia, but the expression what's that when it's at home? fits the bill.