That guy that Mario likes to ride. He's green, but can turn blue when Mario's been on him long enough.
Mario: Hoho! *jumps on Luigi's back*
by Ninjagecko August 03, 2007

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A referance to a nooblet in real life or in games, the word is originally taken from Mario's half-assed brother who tends to fail in everything, and required constant management or supervision.

The word took on a different meaning due to the actions of a certain individual, famous throughout MMO's for his love of Luigi as a nickname and his constant habit of messing things up, thus causing natural, environmental, or social crisis.A person who does not focus in a conversation and suffers an extreme lack of short-term memory as well as having the ability of blocking out certain sounds or words when it is imperative to hear them. In simpler words, a luigi is what is below the ranking of a noob in all aspects of life.Luigi is gaining in use especially among the online community.
The word can also take on a greater social meaning through the word Luigisim which is a social state where only noobs or retards are left to manage society.
*in an utter hopeless screwup*
the appropriate use of luigi would be:
"OMG, that was so luigetic"

by ToxNanVe March 19, 2008

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a toilet, craper, and john
" I have to go use the luigi."
by MC RAY November 29, 2006

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A boy who loves with all his heart. A boy who doesn't know the word selfish or harm. A boy who will make sure that your always happy, and would go to the ends of the earth for your love. A boy who will always have your heart till the end of time.
cristina loves luigi so much.
by Cristina a.k.a crissy May 09, 2005

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stoned breaker from Y-town AZ
Luigi gets sick with it!
by aa November 20, 2004

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Verb: To do or say something so incredibly gay that it could only be described via the way-too-powerful-to-be-fair uppercut (the infamous Up+B attack) used by Luigi in N64.

1. Dude! You are such a cheap player! Stop using hacks! If you Luigi me again one more time, I'm gonna rip your freakin' eyes out of your head and strangle you with your own ocular cords... Twice.

by Link&Samus December 12, 2007

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