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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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 24, 2011
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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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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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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 08, 2005
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Initially designed to strengthen tanks, a reactive armour, that explodes when hit by either kinetic energy or high explosive antitank (HEAT) projectiles, disrupting the round, and degrading its penetration. Explosive reactive armour is most effective against HEAT rounds.

The new Russian Kontakt-5 ERA is not completely destroyed when hit - it still functions as armour after exploding.

Anti-tank weapons work by piercing the armour and exploding inside, thus killing the crew.

Explosive reactive armour counteracts the force of the explosion by creating another explosion on itself. Against shaped charged missiles, this type of armour really comes into it's own.

The design was patented by Manfred Held in the 1970's.
ERA will save the lives of the crew and allow the tank to fight another day.
by Gumba Gumba April 13, 2004
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What can happen when you basically neglect you child's social/emotional needs. They develop this mental illness and become extremely insecure, immature and problematic, and get a really low self-esteem. If not treated, they can self-harm and become manchildren with an inferiority complex and constantly tantrum like a severely autistic child, and the disorder becomes very hard or just impossible to cure.
I regret neglecting my daughter. She developed this "reactive attachment disorder" and she had to be put in foster care because she went crazy.
by PorcupineCanadian December 30, 2016
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