Top Definition
a girl who talks about the same thing over and over; a girl who has an interest in just one thing and finds any reason to insert that interest into other, and sometimes non-related, things.
lisa (normal person): i can't find my cat.
tara (the one note betty): OMG, i got this cheetah print top at forever. you will soooo love it!
by not a betty October 15, 2008
5 Words related to one note betty

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