The name is derived from the television show, The Simpsons, Fallout Boy is the young sidekick to the Superhero, Radioactive Man. Like Robin is to Batman.

The band Fall Out Boy is currently(2005-06) very popular. However, they give what is quite possibly the worst live performance of any major record label band currently out.

The guitarist and bassist insist on being in constant motion while on stage, including jumping in 360's, getting on top of amps, and jumping off of stage platforms, even though they are physically incapable of continuing to play correctly while doing so. The lead singer/second guitarist can neither sing, nor play guitar well, much less perform both tasks at the same time. This produces a stage sound and presence which is highly unnatractive, and very unpleasant to the ear.

Their songs are pop-driven, somewhat simple, yet varied, and feature many catch phrases that will be branded all over your friends' AIM profiles and Myspaces for the next few months.

Examples:

"Drop a heart, break a name"

"I'm just a notch in your bedpost, but you're just a line in this song"

"Sugar, we're going down"

"We'r always siffee ee eida sefehh fodah roongg teeee"

As the last quote demonstrates, most of their lyrics, even on the studio tracks, are indiscernible to the common person's ear. But not the 8th and 9th grade girls. They can mysteriously hear all of the lyrics and find great, deep meanings in them.
Girl: "OMG i loove Fall Out Boy, 'Sugar We're Going Down' is the anthem of my lifeeee"
Guy: "I think we need to break up"
Girl: *sad face* "I'm just a notch in your bedpost, aren't i?"
Guy: "Yeah, seriously, we're not even going to be friends anymore."
by Rockbutnotroll March 11, 2006

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Fall Out Boy is an American pop-punk band formed in Chicago in 2001. The band consists of bassist Pete Wentz, drummer Andy Hurley, lead guitarist and vocalist Patrick Stump, and guitarist Joe Trohman. In their early years, the band released four albums: 'Take This To Your Grave', 'From Under The Cork Tree', 'Infinity On High' and 'Folie à Deux'. They went on a hiatus in 2010, and came back in 2012 . They then released their two most recent albums, 'Save Rock and Roll' and 'American Beauty/American Psycho'.

Singer and guitarist Patrick Stump produced a solo album during the hiatus, called 'Soul Punk', which he wrote and produced entirely by himself. He also played all the instruments.

A few months after the release of 'American Beauty/American Psycho', Fall Out Boy announced they would remix the entire album. This album, called 'Make America Psycho Again', was released very recently. The band worked with a lot of rappers on this remix album, e.g. Azealia Banks, Whiz Kalifa and Juicy J. They have coöperated with rappers before (Big Sean has a part in 'The Mighty Fall', a song on the 'Save Rock and Roll' album).
Fall Out Boy has announced that they are going to remix their latest album, 'American Beauty/American Psycho'.
by p steezy January 15, 2016

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an American emo band that tons of teenage girls love; thought to be very underrated by them but in fact is very overrated. Also used to describe very long phrases from their song titles
oh, my life is too short to be a fall out boy song title
by gayprawnisosom March 28, 2015

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A male or female asshole that has been penetrated so much by penis' and various other objects that when they sit down on the toilet the poop just falls right out.
Wow I hooked up with Sara last night and you could drop a baseball down that fall out boy of hers.
by DonSquigie January 02, 2011

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A Bunch of emos you get together and bash strings.
One time me and my friends cut ourselves and made a band called fallout boy.
by T_box June 27, 2007

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a horrible disease that millions of teenage americans suffer from.

the FOB virus is airborne, one is contaminated with this virus as soon as they hear any pop fall out boy song.

symptoms include include a significant change in sexuality and wardrobe such as : guys wearing mascara and eyeliner while wearing flourescent colored "Youth Small" sized DC shoes shirts, ripped up pants and having a weird haircut with bangs that cover half your face.
we must stop the Fall out boy virus with DEATH METAL, the antidote.
by tha truth teller March 27, 2007

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the definition of fallout boy is:

shit.

possibly one of the worst bands ever created.

any fan should be ashamed of themselves.

=]

fall out boy is also referred to as "when you shove a branch in your dickhole or cunt and find some sort of twisted pleasure out of a slivered cock/twat.
Man, i'm really in the mood for another fall out boy

Can I wipe my ass with Pete's ugly face?

emo cunt-DON'T MAKE FUN OF TEH FALLOUTBOYZZZ. THEY'RE MINT OKTHNXBAI xxcore

me- T_T *shoots you and the rest of the falloutboy bitch army*
by jessicasevenfold March 17, 2007

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The downfall of music as we know it.
OMG like Fall Out Boy Totally ROX!!!
by Dirty Monkey Sex December 04, 2006

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