What do you mean 'what do I mean'?

Compiling a top ten European films of the decade is a tricky business—what do we mean by "European", by "film", or even by "decade"?' — The Auteurs

That level of scepticism surely creates problems for more than just the writing of a 'best of decade' list. "Getting" up in the "morning" would also be pretty hard to interpret. As would "going" to "bed" at "night." Having "lunch", "going" to the "john" and "taking" a "dump" could also prove highly problematic, for what do any of these things mean?