Using a location based check in app such as Foursquare after the fact. For example - checking into a bar the day after you were actually there to get points.
"WTF - I saw Joel check in to Lucky's bar at 8 this morning! Nah dude, we were there last night - I think he was reactivating for a badge."
by pauldonyc August 25, 2011
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The philosophy of engaging in political activism but limiting that engagement to posting on social media.
Jane believed in reactivism, she regularly re-tweeted all the liberal tweets.
by riskdoctor2 August 16, 2017
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The art of trying to appear to be listening to someone, but just reacting to the last thing they said in an agreeing manner.
I was talking to my buddy Bob about my daily grind with work, and my wife making a big deal about the "hassle" taking our daughter to Disney Land.

He replied with "Yeah, Disney Land can be pretty stressful." ... He totally missed my point, typical Reactive Listening!

Antonym: Active Listening
by Kuhnaydeein June 30, 2014
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A state of hyper reactive where you are so charge you could be run a nuclear power plant
She was hyper-reactive last night
by Peta and Geoff April 8, 2005
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If someone injures themself (in this case, typically a burn from carpet, grass or perhaps trampoline) and your body reacts to it in a bad way, you can get reactive acne. It’s a type of acne that spreads like a rash along your legs or arms (depending where you had the injury). If you see a case of reactive acne appearing anywhere else on your body, it is NOT normal. Please go see a doctor, or make sure it’s definitely reactive acne first.
Reanna fell on the trampoline and scraped her knee. Therefore, reactive acne spread across all her legs.
by alvssandra April 16, 2022
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Otherwise known as LAZY fucker Syndrome or RL

When you tell some one that there going out and they bitch and moan till you get them a cab and make sure they dont have to put much effort in.
Reactive laziness examples:

Me - Yo m8 its your turn to cook.
RL - "fuck that i will call a takeaway"

Me - come on its to go to the pub
RL - Aww i cant be arsed lets get a cab
Me - but its only 2 streets away
RL - "SO? if no cab then i aint going"
by Darkhorsevru July 12, 2011
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It's a passive self-protection system for the battle tanks, especially against kinetic energy penetrators and shaped charges. It is used wolrdwide, although the Russian system differs slightly.
The Russian reactive armour consists of Ukrainian washing machines and toilets while they're liberating their neighboring country from Nazis.
by O. W. Tongueincheek March 23, 2023
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