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1.
Implies scorn, mockery, or derision that is manifested by either verbal or facial expression.
Two sisters are talking older sister says " I am sooo special!" Little sister smiles a wicked smile and says "Yes, you ARE special, now go get your helmet your lil' bus in here!" Wow, the older sisters friends say " Your lil' sister is soooo Sardonic"...
by M.Boyle April 17, 2007
 
2.
A form of humour that exists purely to help office workers survive corporate bullshit though the use of sarcasm, cynicism and irony.
Performance Review:

Boss: We're all on the company bus. You've been making some disruptive noises from the back. Are you planning on pressing the bell to get off soon?

Employee: Who's driving the bus? (Sardonic answer to a ridiculous statement)

_________________________________________________
by A_Worker December 22, 2010
 
3.
disdainfully erotic or skeptically humorous and vaginal.
When Grey told Brown he was being sardonic, Brown was not aroused.
by humpy321 January 07, 2006