An adjective meaning
cool,
freaky, groovy, amazing, or all of the above, depending on the context in which it's used. Although "trippy" is a fairly new word, the root word, "trip," refers to
soft psychedelic trips and has been in use since the 60's.
Person 1: "Whoa, dude. Those yellow fractals in the
air are
pretty trippy..."
Person 2: "Um, I think you've seriously gotta cut the
acid. That's the McDonald's sign."