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1 definition by I-Yes

 
1.
(Felps-ee-un)

1. Having the characteristics of Michael Phelps

2. Used to describe something that is mind-blowing, unbelievable, record-breaking (mainly this one), incredible, etc. especially a feat.
1. If you can break world-records in everything you compete in, you're Phelpsian

2. On Guitar Hero, clearing Through the Fire and Flames 100% on Expert is a Phelpsian feat.
by I-Yes August 18, 2008