To be in a very happy/random state, often being extremely spontaneous, and laughing at almost anything. Usually arises from extreme tiredness or light-headedness.
John was laughing for an hour today because someone said 'turtle!' He's being really wiffly.
by Andor Gillian June 21, 2011
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Acronym for "when I fucking feel like it." Useful as a catch-all answer for when you're going to get something done.
Boss: When are those floors gonna get swept?
Employee: Wiffli.

A: When are we going to the store tomorrow, anyway?
B: Probably wiffli and not before.

I'll get to it wiffli, man. Don't get all bent out of shape.
by Talmanes October 29, 2007
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An acronymn for the term "When I Flipping Feel Like It".
I divide incoming work into 3 buckets: Required, Optional, and WIFFLI.
by dilbertisking July 09, 2013
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