A "street party" is when a bunch of homeless people get their soup from the soup kitchen, pour it on the street, and play slip and slide.
Friend 1: Hey, man, why were you late to work?

Friend 2: Sorry, man. There was a street party on 10th street and I had to go a different way because of the smell.
by Dr. Poopyhead May 11, 2016
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Riot, esp. one resulting from food/medicine shortages or economic collapse.
"Stay away from city centre tonight, I hear there's going to be a Brexit Street Party."
by Pulger October 23, 2019
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