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1.
Short for 'mediocre' but used in a sense that something is 'fucked up' or 'shameful'. Can also be used as a replacement for the slang term 'grimey'
"Yo you're medi! why u have to slash his tires like that?"

"Can't stand to watch him. His dance moves are straight medi."
by J. Phillz January 29, 2009
 
2.
A Jew
That guy was so tight he was a medi
by BlackbeltSickunt May 22, 2011