There are 2 definitions of this word:

1.) -a band whose members include Little Jimmy Urine(lead singer), Kitty(drummer), Steve, Righ?(guitarist), Lynn Z(bassist), and formerly Vanessa Y.T.(bassist). They sound like punk rock, techno, and rap all mixed together and describe their music as "industrial jungle pussy punk".
as if their parental advisory-labeled lyrics aren't controversial yet wicked crazy-awesome enough, their shows have involved Jimmy setting his dick on fire, drinking his own pee, making out with girls and guys in the crowd, ect. The cds you will most likely be able to find are "You'll Rebel to Anything(As Long as it's not Challenging)", Frankenstein Girls will Seem Strangly Sexy", and "Tight". In my opinion, THEY FUCKIN ROCK!!!

2.) -the act of masturbating (which is probably how the band got their name.)
I practice a mindlessly self indulgent mindless self indulgence. I have mindlessly self indulged many times before. In fact, I mindlessly self indulged just last night. I will mindlessly self indulge tommorrow, too, because I mindlessly self indulgently mindlessly self indulge everyday. I am mindlessly self indulging right now over my favorite band, Mindless Self Indulgence.
by olalola January 1, 2006
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A band that is classified under their own name and that of which is evil yet delicious. the left rights are a part of the label..band consits of Little Jimmy Urine, Kitty, Steve Righ? and Lyn-Z..very awesome.
I wish that the band Mindless Self Indulgence would come back to Norfolk so I can fuck Jimmy Urine
by Fairy of the Mushroom June 3, 2004
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Greatest fucking band ever with the most hottest bassist ever. (See: Lyn Z). We're getting married.
MSI is tighter than a 12 year old pussy.
by Dyyyyke... December 31, 2005
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The urge to touch one's self. To please your naughty bits mindlessly.
I made sweet love to Jimmy Urine and now I'm gonna Mindlessly Indulge Myself. *fingers anus rapidly*
by Steve, Righ? May 12, 2003
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Best band in... New Jersey although they are not from New Jersey, they are the best band in new jersey, i love em
by Matt Allen July 8, 2003
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soundtrack to the life of a tormented suburban cry baby. Hell yeah... I love it!
....none needed
by Alex November 19, 2003
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