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The spelled out version of the noise you make while puking, vomiting, throwing up, or blowing chunks. This usually comes about due to having the flu, drinking to much alcohol, or being out of shape. Or when someone mentions something you find completely disgusting.
Jennifer asks, "Austin try some of this haggis, it's really good!"

He replies with only the noise "Boolaahhh"
by millerkiller267 January 09, 2012