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Noun. A portmanteau of "sushi' and "sewage" which makes no sense. Yypically used by youngsters around the Boston area to describe the contents of the New York/New Jersey border region or anything of an unfavorable nature.
"Yo did you go to the cafeteria today?"
"Yeah what was with that, it tasted like burnt shushage"

"I heard there's a lot of shushage on the border of New York and New Jersey"
by derNeger May 03, 2010
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