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1. To do something rebelliously; often disobeying authority or some other source of external social pressure.

2. Common mis-spelling of definitely, often arrived at when a person types definatly or definately into a spell-checker, and the spell-ckecher changes it to "defiantly".
1.
A. Go away you moron!
B. (defiantly) No.

2.
A. Do you want to work 30 hours' unpaid overtime this week?
B. I defiantly don't.
by fwe22 August 28, 2007
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3
When peeps try to spell defenetly but FAIL

IRONY
YOU: defiantly noticed that IRONY
Me: DONT JUDGE ME BUM HOLE
by I am yetched March 31, 2017
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