Top Definition
a feeling brought on when a current fling's attitude reminds you of an ex-girlfriend.
if your current girlfriend happens to piss you off because of her lack in a display of affection, and this fact reminds you of an ex girlfriend, then she suffers from the "O" syndrome.
#bitch #coincedence #reminder #the o #sindrome #awkward
by Mark Ray May 07, 2006
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