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."