To sleep in one's clothes, as done by the character Marty McFly in the movie "Back to the Future". Also known as "Michael J. Fox it".
I'm too tired to change into my pajamas. I'm just going to Marty McFly it.

I'll lose my sleepiness if I change into my pajamas. I'm just gonna have to Marty MacFly it.
by MacFly April 20, 2010
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A trick in skateboarding. When you are done skating for the time being you and kick the tail of the board sending it into the air and lands in your grasp.
Explanation: Why are those kids so astoundingly happy when they received their (skate/hover)board back from Marty McFly in the Back to the Future trilogy? The only trick that he does is kick the board up to his hands and give it to the child... silly Marty, you ain't that sweet.

Ex 1: "Dude you've been skating all day... Marty-McFly that bitch and lets do something else"

Ex 2: "Yo, Marty-McFly your board and let me try a kickflip"
by Stevenoni January 20, 2008
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a 'fan' that screams in mcfly's faces. stalks mcfly. thinks they know everything about mcfly. oh, and most of the time.. they end up on mcflysecrets :)
can be either gender.
"she/he's a mcfly teenie! look at her/him! stalking mcfly! omg, shall we go & try and meet up with them & get on mcflysecrets?"
"YEAHHHHHHHH!"
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noun or verb
a specific type of threesome with two partners separately but at the same time due to the 'Back to the Future' like time travel that occurs in certain countries on the first Sunday in November at exactly 2AM.
"I had sex with Jessica at 2AM, and precisely one hour later I had sex with Bridge... at the exact same time! Its a Back to the Future threesome! I did a Marty McFly!"
"Whoah, this is heavy."
by Great Scottt February 3, 2019
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A sentence used by Biff in Back to The Future or to say a very famous line from the Bully Biff
Hello, Hello, anybody home? Hey, Think McFly, think
by Yrudjfjrndnfnnf June 22, 2021
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To walk backwards haphazardly, usually resulting in an unwanted encounter or physical altercation. Derives from Marty McFly from "Back to the future", as this action usually precedes a very bad event.
That kid over there was Marty McFlying all over the store and knocked down the tower of sodas.
by F. Millmore April 23, 2010
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A mouse by razer that was supposed to fly over your desk, so you no longer needed a mousepad. Turned out to be a joke
12 year old: Dude I can’t wait to complete my razer only setup with the Project Mcfly! So I can’t play Minecraft and Roblox

Dude: Bro it’s an April fools joke you dumbass
by TTeku January 7, 2022
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