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a youg girl who thinks that they are a biddy. see also "prostitot"
those nasty itty-biddys keep trying to rinse me.
by eric gordon May 14, 2005
a tiny or "fun sized" biddy
Ron: Hahaha that really short girl is kinda hot

Tom: lmao shes an ittybiddy, man!

Ron: Objectifying women is fun!
by Lomov February 27, 2011