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Simply some one who is rather dimwitted and stupid or does something, says something idiotic or stupid.
Bob - Where did I put those keys?

Andy - In yer pocket, shrimp brain.
by Freedom Mine November 15, 2013
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2
Shrimps shit with their asshole, which lies on their forehead. So basically an alternative to "shit head".
-Dude, where's your apartment?
-You asked me for the 6th time this week you shrimp brain.
by Phqu September 21, 2016
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