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1.
1. A party where there is no drugs or alcohol involved.

2. Being sober for a certain amount of time after having been under the influence for an extended amount of time.
1. I went to a college party expecting to get wasted but it turns out it was a total soberfest.

2. A-"Hey man, you going to head with us to Oktoberfest?"

J-"Nah bro, since my DUI its nothing but going to be nothing but soberfest till this gets cleared up."
by Digitaldeath December 26, 2010