Context #1
Tom: Remember our high school P.E. teacher Mrs. Stevens?
Chris: Yeah, of course.
Tom: Well I ran into her at the store yesterday. It's been like 20 years.
Chris: Wow! That must have been a trip!
Context #2
Sara: Did you see that new Matrix movie?
Jane: Yeah, but it was a little strange.
Sara: I know. That movie is a trip.
Meaning: "a trip" is a noun that is used as a kind of slang word to mean something that is strange, unbelievable, or really fascinating. The adjective is "trippy." It is used more by guys than girls.
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