up one's own ass

• up one's own arse

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up one's own ass

1. (idiomatic, vulgar, Canada, US) Having an excessively high opinion of oneself, excessively preoccupied with one's own affairs, or lost in self-regarding abstraction.
   • 16 February 2003, The Times - Motor Racing: Coulthard’s driving passion

     [David Coulthard on Michael Schumacher] Considering the success and money he's earned, it'd be easy for him to disappear so far up his own arse, but he hasn't; there's something down-to-earth there

   • 9 December 2003 The Advocate (magazine) No. 904

     It's nice to be able to look back on the thing, because I was so up my own ass at the time about everything that it was hard to enjoy all the craziness...

   • 19 February 2006 Sunday People - EXCLUSIVE: ON ME WEB CAM, SON!

     Just like Leslie Grantham who also slagged off his costars, Forgeham blasted Zoe as "egotistical" and said she was "full of herself...and up her own ass"

• up oneself