The act of inhaling, and immediately "shooting" the smoke out of your mouth before taking another drag.
hoo-PAH! hoo-PAH! hoo-PAH! would be a literal explanation of machine gun smoking
by egopimp August 14, 2006
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The sudden impulse to turn around and smile at your friends the first time you fire a fully automatic weapon.

-This phenomenon also happens each time you shoot an automatic weapon larger in caliber than your previous experience.
Guy #1- Dude, I got to shoot a .50 cal for the first time today and I was all smiles.

Guy #2- Sounds like you couldnt hold back the machine gun reflex.
Guy #1- Well they say, "Happiness is a belt-fed weapon".
by epimethius05 March 11, 2010
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when a man is hitting on multiple women in hopes of at least landing one, similar to a spray and pray with a machine gun, since during a spray and pray there is always a high chance that at least one bullet will hit its mark.
Joseph was super horny, so he utilised the renowned machine gun theory to get some pussy.
by PapoTruco00976 January 6, 2018
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Shooting an unlimited ammo machine gun in an FPS game like any Halo game and Call of Duty 4 or something like that.
I was playing Halo 3 on Live and this guy was machine gun spamming a rock and it annoyed my dog who was watching me play. He got used to it and started masturbating.
by Dan the =EPIC= Man June 2, 2009
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a pop punk rockstar/rapper who is completely underrated. some call him a poser but i know of a lot of people who have said that his music has saved their lives. he talks about the reality of the world and helps people feel heard. so many people hate on him because he isn’t like other celebrities. he stands out in a crowd and you could see him coming from a mile away. his music is different than any other type i’ve ever heard and it’s easy to listen to but also easy to cry to. his concert was something i’ll never forget, he is such an amazing performer.

i love him so much and i’m so thankful for his music. ESTXXXX
Person 1: “Have you heard of Machine Gun Kelly?”
Person 2: “Yeah! His music is so underrated!”
by callmehay December 1, 2022
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