overreactionary 

My YouTube Channel aka someone who is in the act of over reacting. Used as an adjective.

The fans were overreactionary at the stadium when their team won.

overreactionary by Overreactionary July 13, 2022

Overreactionation 

When one over overreacts to something that is minuscule in nature or unimportant to anyone or anything, ever. Or even making up their own crap and adding their own reaction for it and taking it to an extreme for no actual purpose.

Vietnam was just one big overreactionation.

Overreactionation by Camera Face March 14, 2019