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(1) A Marine who reports to medical after doing an incredibly stupid act.

(2) The polar opposite of a genius.
Sgt. Smith is a true Marineius, he ran into a pole during a formation run and broke his nose.

Doc: Why do I have to be out there at 5am?
Marineius: We want to start the training by 7.
Doc: You are a Marineius.
by yaymarinecorps April 15, 2010
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