Head Trip Meaning

(idiomatic) An ego trip.

Example: 2009 July 10, Martin Fletcher, "Beware Invisible Cows, By Andy Martin" (book review), The Independent (UK) (retrieved 23 Aug 2014):
  Not that Martin is a sun-bleached hippie philosopher, but his book is a head-trip as well as a hugely entertaining travel adventure along the eccentric orbits of cosmological research.
1994 March 6, William Grimes, "Thing: Sleight Of Eye," New York Times (retrieved 23 Aug 2014):
  Part picture book, part head trip. "Magic Eye" presents 22 color images called "single-image random-dot stereograms." When looked at in a certain way, they spring mind-bending surprises on the viewer.
2007, Richard Corliss, "DVD and Conquer: 2001: A Space Odyssey," Time (retrieved 23 Aug 2014):
  An essay on man's destiny, the film was for some of its late-60s viewers a light show, a head trip, needing no earthbound explanations.
2000 June 17, James C. McKinley, "Baseball: Amateurs Say Easy Throws Can Be the Hardest," New York Times (retrieved 23 Aug 2014):
  "I think the pressure of being center stage has a lot to do with it. . . . He's got the talent. He's just got to shake off this head trip."