Taken from the hit Movie Back To The Future, used to context to indicate someone has made a poorly thought out decision lacking in judgement and basic common sense. SAid in a sarcastic tone of voice.
"Hello, McFly?" - followed by a rapping on head gesture when someone asks an obvious question.
by Steinfiend September 20, 2003
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A band, yes, a BAND. And in my opinion, they ARE talented, and they play GOOD music. No, they are NOT punk or emo. They are simply POP. To the closeminded freaks who say people should listen to "good" music, shut your mouth and keep the hate to yourselves. McFly is a good band, whether you like them or not!
Someone who likes only one's music...
Closedminded freak: OMG!!! I H8 MCFLY!!! I LYKE LUVV MY MUSIC ONLII LYKE OMGG!!!
Me: Shut up.

Someone who doesn't like McFly but respects people's opinions...
Openminded person: I don't like McFly but it's your opinion if you like them.
Me: :)
by SolitaryxChild May 17, 2006
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McFly are obviously a cause for much debate, alot of people respect them as musicians that cater for a section of the counties musical tastes, while another section of people persist in trying to rile their fans. I think we can see who the children are here.
McFly write songs that are pop, yes, and no, they do not pretend to be rock.
If McFly are only for conformist people then why do McFly fans get laughed at and told they are wrong everyday? If you have all forgotten, being a conformist is doing what other people WANT you to do. Liking McFly's music is not conformism, it is musical taste. Just as liking Guns n’ roses, Bullet for my valentine, Slayer, 50 cent or any other band is. People say 'McFly were manufactured for 8 year-olds' well The clash were manufactured for punks... do you have a problem with that?

As for the claims that they are manufactured do your research before you judge. Tom and Danny met at an audition for Busted WHICH THEY DID NOT GET INTO and spent alot of time writing songs in a hotel room before placing a PRIVATE add in the indie rock magazine NME to which Dougie and Harry auditioned for. Because Tom had almost got into Busted and had attended alot of other auditions he was known in the industry and soon McFly's talent was spotted and they were signed.
Does that sound manufactured to you?
To me that sounds like a band who worked for what they achieved.

McFly's Influences include the beach boys and blink 182. They describe their own music as 'pop-rock' and decribe themselves as 'A boyband with guitars'.
McFly's first single 'five colours' went straight to number one in 2004
by Imogen Bird February 24, 2008
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One of the best boy bandish bands in the UK. Sure they may play pop music but they do play their own instruments and write their own music. Stop dissing them.
McFly?! Oh you mean that great band!! Yeah, they're great.
by Kaley C May 31, 2005
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A unit of measurement consisting of the product of meters cubed and kilograms, divided by seconds raised to the fourth power.

(m^3)kg/(s^4)

The McFly is based on multiplying 88 Miles Per Hour by 1.21 gigawatts, as described in Back the the Future.
Driving at 88 miles per hour and receiving 1.21 gigawatts from a bolt of lightning gives you 47,600,000,000 McFlys, or 47,600,000 kiloMcFlys, or 47,600 megaMcFlys, or 47.6 gigaMcFlys.
by Baller-Ass Nigga October 21, 2004
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A UK band that is often compared to today's One Direction. They are TWO different band. so just because Mcfly doesnt talk about a girl being beautiful and junk they are hated. man up, there are other things in life.
One Directioner: Omigod i love 1D they're so hot, cute, talented blah blah blah.
Me: Personally I like McFly.
1Der: how could you like them they ripped of 1D blah blah blah.
Me: -_- STFU
by McFlyin' June 8, 2012
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A debilating cramp that occurs while manipulate ones genitalia, also known as temporary parkisons.
"The other day I was jerking it, I got so into it I pulled a McFly"
by Lagginwaggin June 25, 2009
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