A fairly old term meaning groovy, rad, cool, weird, etc. Referencing a psychedelic experience or item. Mostly used to make fun of the 90's and early 2000's, and primarily used in a sarcastic manner.
"Dude, my new iPhone doesn't have a headphone jack"
"That's pretty trippy, man."
Comes from the word "tryptamine", which is a toxin found in the mushrooms that give a hallucigenic affect when ingested. Once origianally discovered, this fungi was named "magic mushroom".
An adjective retards use to describe anything that looks remotely like a hallucination you see while on an LSD trip to make themselves seem "cool" when in reality they've never even seen the stuff...
adj. Something that stimulates one or more of the senses in a peculiar way that is very enjoyable, usually when observed under the influence of something
syn. Trip, trips, tripped out
"whoa man those fireworks are TRIPPY" (while on mush)
"duuude check out this light show on youtube its trips"