Derived from a series of vulgar words such as: cockfuck and cuntfuck (one who fucks cock/cunt respectively). Flaaffy is the easier version of Forever Alone Fuck (FAF). Also a second generation Pokemon that looks derpy as shit.
Flaaffy is a person who does not have any romantic potential with another, sentenced to being "forever alone".
If you go long periods of time without having a significant other and won't have one any time in the near future - legitimately, not just being an annoying as fuck twelve year old complaining like a little shit slut whore that you don't have a boyfriend - then you may qualify under the Flaaffy category.

Just kidding. There is only one true Flaaffy
by Ashketchum July 7, 2013
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