Adopting a social cause because it's hip to do so. These people are usually identified by having the personality flaw of being far too gullible and being unable to think for themselves. They are sucked in by modern propaganda and peer pressure.
He got all involved with saving the trees because his friends were all doing it, what a trendanista.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.