Facetious

[Tanya Shivari]

The act of being filipant in a serious situation

[PussyCat]

The word facetious is used exclusively by arts students to describe someone being sarcastic.

Its generally said with a smug voice to make the person feel insignificant.

[Becky]

An assholes word for sarcasm.

[Becky]

Unique as the only word in the English language to sound like a variation of its slang definition. In other words: It sounds like it may actually mean full of feces although it does not...but it does mean full of shit.

[Britney]

to use Humour as an excuse for being a prick

[Rihanna]

Giving a sarcastic answer,to show how obvious something is.

[Britney]

Playfully jocular; humorous.

[Raeanne Dimick]

Given to wit and good humor; merry; sportive; jocular;
as, a facetious companion.

[Oralee]

not serious about a serious subject, in an attempt to be funny or to appear clever :

[Dave Paprocki]

Treating serious issues with deliberately inappropriate humor; flippant.

[Konraddync]

cleverly amusing in tone