Slang: Tripping

Definition: To be under the influence of hallucinogenic drugs such as LSD.

Example: 1) The sky looks red? Dude, are you tripping?

Etymology: In the 1960s, many people used mind-altering drugs, and some people referred to their drug experiences as 'trips' (or journeys). Today the word is usually used in jest, to describe a foolish statement. When someone says something stupid or silly, you might say to them 'You must be tripping'.