Top Definition
A flashback of a blonde moment you or someone else had.

Usually the person flashblonding is thinking about it and involuntarily smiling, which to everyone else is odd because it seems the person is smiling for no apparent reason.
Delia: During the Great Depression, there were many homos.
Sophie: Do you mean hobos?
D: Oh! HAHA, yeah!
...and hour later...
~Sophie is thinking back to this convo. and laughs randomly~
D: You're having a flashblonde, aren't you?
S: haha, yep, you caught me.
by kitimastr October 02, 2009

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