Large boobs by default on a fat girl.
"Megan has huge melons, but they're deffies"
Slang for "definition".
Yo teach, what's the deffy of "missile tits"?
Shortened version of definitely. Often used by teens.
A: "Look at that"
B: "That's cool"
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.
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.