2
To make fun of someone because of there lack of smartness
EX1: Richard is dumb he can't row a boat

EX2: Simon is dumb he can't make a burn to me!
by Coney Jung May 30, 2005
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3
To refer to stupid beliefs, ideas, or ideologies
''Thinking that the earth is flat is just straight up stupidism''
via giphy
by A hypocrite October 08, 2018
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