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1.
(adj) extremely delightful.

{this is actually a word, look it up at Dictionary.com}
Those cookies are splendiferous
by Aaron W. December 05, 2002
 
2.
a rather posh word meaning absolutely bloomin marvellous
my gosh that was splendiferous
by lord robbo August 06, 2005
 
3.
A combination of the words splendid, fantastic, wonderful, and fabulous, generally used to indicate that things are extremely awesome in every degree.
That's splendiferous, man!
by SmithyMissy August 02, 2010
 
4.
The supreme awesomeness achieved when a Splendifer (a tiny, rainbow and sparkly dinosaur that feeds off of awesomeness) has taken residence in your left nostril.
Friend one- "I hope you are splendiferous during your audition today!"

Friend two- "That Splendifer has enough awesomeness to live off of for months, but thanks anyway."
by The Splediferous Splendifer November 11, 2010
 
5.
An adjective used to describe a person who is splendid, magnificent, and carnivorous. Usually only used for a select few.
Brett is splendiferous!
by Pepe21 December 22, 2008
 
6.
a merger of the words "splendid" and "fabulous". (Note: the "fer" part of the term is used as a linking syllable).

A word used to describe something which is so unique in it's wonder that it needs two words of positive proclamation to announce how great it is.
The work of the top order in the innings was splendiferous!
by gizmo78 August 10, 2011
 
7.
extraordinarily impressive; root word: splendor
His personality is splendiferous
by Lo jo April 21, 2008