Top definition
A GREEAT fuck. A girl who is not only hot, but a freak in bed. comes from fabulous and fantastic, combine the two and you get a fantabby.
That girl was a fantabby.
O GOD look at that fantabby.
That girl at the bar last night was a fantabby.
So, what'd you do last night, nothing really met this bitch and got in a fantabby!
by Geejer March 01, 2009
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