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1.
the BEST line from the 2010 movie Despicable Me, and an internet sensation
Agnes: Look at the fluffy unicorn! He's so fluffy I'm gonna die! ... It's so fluffy!!!"
by AmericanJRK July 13, 2010
 
2.
An explanation of happiness, approval or excitement

Synonyms: awesome, sweet, etc
Siara: Janelle, I bought you something really cool!
Janelle: Its so fluffy!
by JanelleFeeley February 11, 2011