A question put on a final exam (typically the final question) that's particularly difficult to answer or solve correctly as a way for an instructor to say one final "Fuck you!" to the student before they finish their class.
The exam was going pretty well for Bobby until he encountered the fuck youquestion on the last page.
Sally gets home from work and finds her new french boyfriend on the couch all cozy with the babysitter... she says "qu'est ce que fuck!?" (so evenFrenchy understands!)