Short for a party in San Francisco called Electro Pop Rocks. EPR is the largest Wednesday night party in California and possibly the largest in the US with thousands of people attending every Wednesday night.
It's generally considered to be the party that shifted the most popular night to go out in the Bay Area from Saturday to Wednesday.
EPR's success has produced several copy-cat parties on Wednesday and even other nights that imitate different aspects of the show.
I went to EPR last night and EPR'd so hard I didn't make it to class on Thursday.
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