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Originally the sidekick to Radioactive Man in the Radioactive Man comic series on the Simpsons. In the film version of Radioactive Man (starring Ranier Wolfcastle) Milhouse was cast in the role of Fallout Boy.
Bart: Well, between us we've read all 814 issues of "Radioactive Man."

Milhouse: Yeah, and we both have the special limited-edition issue where he and Fall out Boy get killed on every page!
by irregardless March 16, 2006
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2
A band, not a "gay shitty ass emo band", a band. That's what some of you guys keep on posting that and we all get it, you don't like them, they may not be worthy of your time, but they do deserve your respect. And you go far enough by saying "all their fans are retarded emo faggots" when you don't even know who half of them are. Just because people like them, doesn't mean they're all "emo", "retarded" or "homosexual."
person 1: Fall Out Boy sucks ass! They're such gay, emo faggots and their fans are retarded!
person 2: Shut the fuck up, all you ever talk about is how much Fall Out Boy "sucks" Gosh, they're just a fucking band, Why waste your life complaining about it, Quit being so bigoted!!!!!!!!!!!!
by falling stars forever April 14, 2007
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Now, let's get a grip here. I may be 14 but I am not confused or a girl. I'd welcome a voice better than patrick's, because there isn't one. FOB, emo? I don't really care what you think, as long as it's about them. Pete's lyrics wipe the floor with any other modern bands I have heard. Stop with the arguments. Fall Out Boy are, have always been, and will continue to be a great band.

Maybe you should keep your jealousy close, cause it's all yours.
Random person - "You heard that Fall Out Boy are coming to play in Britain in march?"

Misgeyman - "Yeah, my and my friends are going to see them in Cardiff!"
by Midgeyman January 23, 2009
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4
1: Fall Out Boy are a band from Chicago, made up of four members... Peter Wentz, Patrick Stump, Andrew Hurley and Joe Trohman. Due to certain lines in the songs, they are considered EMO (by people who need to be shot), but they are actually NOT. They are critised alot for Patrick Stump's lead vocals, apparently, being "horrible" and "hard to understand". The answer to this is, of course, get your fucking ears cleaned out because if TONS of people can hear what the hell he says, why cant YOU?

2: A fact that is NOT known to many people, is that Fall Out Boy actually had a LIFE before MTV. And It was not up to the band to have hundreds of stupid airheaded girls constantly asking for their music videos to be played on MTV due to the fact that "Peter is so HAWT!!!" If you are going to blame somebody in that situation, blame MTV. Or better, the stupid airheaded girls.
1: Sugar We're Going Down: (before your ears get cleaned out) Wee goh in DAH DAH in ah earlieeh rauh! Shu gah wee goh in dah swing ih!

Sugar We're Going Down: (AFTER your ears get cleaned out) We're going down, down, in an earlier round. Sugar, we're goin down swingin.

2: Bimbo: OmmGzz! Petah from Fall Out Boy is So0o0o HawwwTT!
Sensible human being: Stop checking out the members, and listen to the fucking music, you dumbass. And by the way, its PETER!!!
by xVenoma July 30, 2006
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1. A Chicago-based band whose sound is characterized by crunchy metallic riffs and by stop-start rhythms, as well as sometimes cheeky, sometimes emotional lyrics.

Could be (and often is) described as part of the modern pop-punk emo movement, though it has to be noted they are far more rock-oriented and electrically charged than self-admittedly emo bands such as Dashboard Confessional.

Started out fairly indie but has since gained a huge mainstream "pop" audience.

Biggest hits include: Sugar We're Going Down, Dance Dance

Similar bands include: Funeral For A Friend, Panic! at the Disco

2. In the popular TV show The Simpsons, Fallout Boy is superhero Radioactive Man's sidekick.
1. Did you check out Fall Out Boy's new CD?
2. "Radioactive man, look out!" screamed Fallout Boy.
by objective man January 06, 2006
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6
Fallout boy is radioactive man's sidekick, portrayed by millhouse and micky rooney. Fallout boy is toight, fallout boy
fallout boy~jiminy jillickers! lookout radioactive man the sun is exploding again!
by vester ..!.. August 29, 2007
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7
Fall Out Boy is a Chicago based band, that actually had a life before MTV.

It has four members; Pete Wentz, Patrick Stump, Joe Trohman and Andy Hurley.

For those of you who think Fall Out Boy are emo posers; they aren't. They aren't even emo, and, like I said, had a life before MTV. It's MTV that made them so popular, along with some air headed teenage girls, who only listen to them because 'PeTe Iz SoOoOoO hAwT!!!!!11'.

Oh, and by the way, there is no 'Tom' in Fall Out Boy. On the From Under The Cork Tree album, some tracks were mixed by Tom Lord-Alge, which could be the cause of this misconception of the invisible 'Tom'.
Air Head : OMG, LIEK PETE FROM FALL OUT BOY IZ SOOO HAWT!!!!!1
Normal person : Air is leaking out.
by cheapPERFUME September 24, 2006
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