Marios younger brother. Its pretty sad, because in the mario and luigi game on gameboy, when people see you they say "WOW!! Its mario and green dude!!". Often underestimated as a sidekick to mario but is actually better. He is not as fat, can jump way higher, and is much faster. He finally got recognized as a main characyer in the game Luigi's Mansion, a title released at the time of gamecubes launch. A mario game, super mario sunshine actuallt wasnt realeased until some time later.
Player 1: Damn, Mario wont jump that gap!! Player 2: You should of used Luigi, fuckface!!
by only$19.99,less s+h December 26, 2003
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Player 2 in Mario Bros. Has since then gotten more and more personality, while Mario seems to have none.
"Dude, Luigi should get to be in the spotlight more! He's taller and can jump higher!"
by Fredde September 7, 2004
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Mario's younger, taller brother who's fave color is green. Girlfriend is said to be Daisy of Sarasaraland.
by Princess Peach Toadstool June 7, 2003
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Added to the end of a sentence, when in a conversation with a mate and in unusual company, to secretly direct your mate's attention to approaching person(s).

LUIGI = Look Up Instantly - Girls/Guys Incoming.
mate1: did you see those two guys with the sack?
mate2: they look very suspicious, luigi
by noddy330 June 26, 2009
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a close friend or "homie"..someone you are tight with
"YO luigie wats up, g?"
by LADY T October 22, 2005
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The brother Mario. People seem to think he's underrated, although he has a lot of fans.
Luigi really isn't that underrated.
by MR. DOODID October 26, 2007
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He is marios second hand man who always helps Mario in everything but dosen't get any credit, Mario gets coins and a kiss or cake when luigi dosen't get anything when he helped Mario in the first place.
I always use luigi in mario kart
by Randomguy78 March 27, 2013
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