Drastic

[Sarah]

Acting rapidly and violently; efficacious; powerful; -- opposedto bland; as, drastic purgatives.-- n. (Med.)

[Sarah]

a word originating at rchs highschool used when referring to a severely retarted or over exaggerated statement or event or statement that is over the top

[Mark Zuckerberg]

(especially of actions) severe and sudden or having very noticeable effects:

[Vania]

Likely to have a strong or far-reaching effect; radical and extreme.