Top Definition
1. Similar to the word confrontation, only the confrontational act is generally relating to the back side of a person. This this act is most often violating the ass region, thus conasstaion.
"Man, I was just standing there minding my own bussiness then got a NASTAY conasstation from Dameon. My ass hurt for weeks."
by Cinderella 12 April 05, 2009
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