1 definition by sorrio

Top Definition
Your right-hand bro who's always got your back. Most people think that he's little more than some loser that just tags along with you, but you know that he's there to help you out.

Named after the younger brother of the famous Super Mario Brothers.
Person 1 "Dude, who invited the fricken' geek?"

Person 2 "Back off, man; he's my Luigi."
by sorrio January 22, 2011

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