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1.
To apologize for behaviour in advance
Aaron: I'm getting drunk here so I'd like to prepologize for anything I do or say from now on.

Dave: Respect
by badnewsbrookes April 03, 2009
 
2.
To explain in advance that one intends to insult, slam, or belittle the person one is addressing
"I don't mean this the way it sounds, but..."

"Don't take this the wrong way, but..."

Used in a sentence: No. No. Please don't feel you need to prepologize for hurting my feelings.
by Ugbutton May 25, 2010