-adjective

*Something that triggers a instantaneous reaction from someone, without hesitation or thought; consciously or subconsciously.
*Similar to a muscle reflex, except this is a combination of actions that a reflexing from a compilation of synapses from the brain.
The star spangled banner is a reactional song to Americans.
by Gspottrainerguy June 25, 2023
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The reaction during a cumulative process when the nuclei in human semen merges with the other nuclei in human semen releasing a astronomical amount of heat which causes near by molecules to break down and merge with the semen which commences a powerful reaction that is so powerful it is relevant to the amount of power in a nuclear explosion.
Cumulative Reactions are very dangerous. Please talk to your doctor before you decimate your city!
by Bigboisoesthisstuff October 27, 2020
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When three or more Asian drivers rear-end each other in a domino-effect fashion, potentially resulting in multiple accidents, multiple traffic tickets, and a major traffic holdup.
When I was driving home from work and passed by an Asian neighborhood, I got caught in a Chinese chain reaction, and the front and rear chassis of my car got totaled.
by Terminus_Est May 1, 2015
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There he was showing us his monkey motions like Mister Bean, in a reaction video.
by D.M.H.2 January 21, 2023
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The "Argin Reaction" occurs when the host having such reaction starts escalating something in which someone else has been talking about, the Argin Reaction can really get out of hand, but luckily, just find another person who says they finds this disturbing and the person with the Argin Reaction will have a chance to calm down, good examples of the Argin Reaction taking place is in a Truth or Dare game, or Would You Rather.
"I like you"
"WELL I LIKE ALL YOUR ENTIRE FAIMILY blah blah blah..."
"Oh no, it's the Argin Reaction!"
by NarwhalAreKool December 4, 2016
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Reacting according to a certain habitual manner; unthinking:

a knee-jerk conservative.
When you talk about issues today, all you seem to hear is a me-jerk reaction.
by Chefspam April 30, 2018
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