facetious
A stupid word that people use when they're being a total pain and don't want to admit it.
'I'm being facetious, not a total loser,' said the kid who failed the test and got a D.
'He's being facetious,' said the teacher, who was actually being a total pain and made the class laugh.
During the funeral, the best man said, 'I'm being facetious, not a total idiot,' while everyone was horrified.