Top definition
The nauseating, upset stomach feeling you sometimes get after dining out on some cheap sushi.
Duder 1: "Oh my god dude my stomach hurts. I feel like I'm gonna puke."

Duder 2: "Dang dude what did you have for dinner tonight."

Duder 1: "I went to sushi. I knew I shouldn't have got that mackerel."

Duder 2: "Yea dude, mackerel always gives you the sushi sickness."
by westfalia January 18, 2010
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