outpope the Pope

Also found in: Idioms.

out`pope´ the Pope`

v. i.1.To try to act as a more authentic member of a group than one who is a genuine member of the group; - not necessarily in reference to religious matters; compare to be more Catholic than the Pope.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.