1. Something that you say when someone does/says something that they would do when they are mad high.
2. Anything funny or cool that someone says/does that would be greatly enhanced when that person and the group of friends he/she was with when they were all mad high.
1. (Person 1) Dude, let's go get some tortilla chips, but instead of salsa, let's use NUTELLA!!
(Person 2) Haha, that's so high.
2. (Person 1) Dude, how fun would it be to go to Burger King, then take our food and climb up the service ladder and eat on the roof!
(Person 2) That's so high. Let's do it!