An act of forewarning someone that you are about to insult them, right before you actually do insult them.

For ex: I don`t mean to be rude (the diss-claimer)
Don`t take this the wrong way (the diss-claimer)
Yo, I`m gonna just throw out a Diss-claimer right now, so don`t take this the wrong way, but damn are you ugly!
by Funkyzeit November 15, 2006
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