A person who has the mental capacity equal to, or less than, that of a potato.
Swaggot: Ay, bruh, I got dat #SWAG

Guy: God, you're fucking potato brain.
by Manatee God July 18, 2015
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When someone has the mental capacity of a potato or the same habits of a raw potato.
Human 1: Hey potato brain get up!

Human 2: ..... *silence* .....
That's one potato brain!
by Mr.Potato Head April 24, 2017
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A temporary feeling of retardation that occurs while studying for a promotional process where a plethora of some useful, mostly useless, contradicting BS, is the subject matter.
Rookie: Sir, can we go over fire behavior today?

FF: dafuq is that shit?

Officer to rookie: Stay away from him, he's got mashed potato brains.
by A sad FF April 22, 2017
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That feeling of mental retardation after coming down from a long night of tripping on acid
Man, I caught some major mashed potato brains the last time we tripped. I don't think I could deal with that again.
by hobolizardg January 4, 2012
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a large grouping of hard snot or a solid booger extracted from one's nostrils while contemplating any subject.
while answering my girlfriends question about whether or not her sister beulah with the acne problem was attractive i rubbed my nose and discovered a large mass of hardened snot i then proceeded to pull it out, scrape it off in an ashtray and said to my girlfriend, fuck no !!!! stupid. i just yanked a brain potato so large it would pass for your sisters left cheek.
by fixer 2006 April 24, 2007
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