Anything that causes you copious amounts of stress. An antidestressant can be a person, a job, school, etc.
Neil: "Man, everyone is dumping their problems on me lately and I got all this other stuff I gotta do and I feel like I'm gonna explode!"
Bob: "You need to back of the antidestressants and just learn to relax!"
After he studied his state representative's beliefs he decided to become an antiestablishmentarianist. My folks aren't happy that I am an antiestablishmentarianist.
Marked by opposition or hostility to conventional social, political, or economic values or principles, the doctrine of opposition to the social and political establishment
Kanye West has been fed his dinner of antiestablishmentarianism, washed it down with a carafe of idiocy and spewed it all up during the hurricane katrina disaster fund telethon