Top Definition
Describes someone who does something random on a whim, often unrelated to whatever the person is doing currently.
That girl is so izzyful, she'll break out in song in the middle of a test.
by ravenwarrior April 14, 2011
1 more definition
A word found in many high school english grammar books.
You so Izzyful!
by lisalover09 September 02, 2009

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