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1.
A girl who posses unnatural blonde hair. Derived from the term used by Losties to refer to fake Locke.
Check out that flondie over there...she'd probably look better her natural brown hair.

Damn Melissa turned herself into a flonde last week when she dyed her hair.
by skittlezzet September 20, 2010
 
2.
When the words -blonde- and -flat- combined to form FLONDE. A blonde chick who has no titties.flat as a board.
1.eww, she's so flat and blonde, what a fucking flonde!!
2. Rose that stupid tit less bitch, she's such a flonde
by Vicky Navea February 19, 2006