Shortened version of definitely. Often used by teens.
A: "Look at that"
B: "That's cool"
C: "Deffy"
by Sarah June 28, 2004
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definitely, totally, absolutely, with certainty (adv.)
We should deffies go to the movies later.

Note: In most situations, deffies can be substituted for totes or probs to add an extra sprinkle of awesome sauce to your sentences.

Also note that deffies is not a derogatory term for a group of multiple people with extremely poor hearing.
by Suz! :) November 09, 2010
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To make an emberassment of oneself. To fail at suicide in an attempt of gaining attention.
Deffy slit his wrists like a little school girl.
by Anonymous October 02, 2003
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