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1.
An underage girl who you can tell is going to be very attractive when she gets older. Like a bottle of wine you would put in a cellar to age until it is drinkable.
Woah, that girl is going to be hot when she get's older! She's a definite Cellar Girl.
by thirdhouston January 09, 2008
 
2.
an unfortunate girl that is kidnapped and held captive in a cellar, basement, or otherwise imprisoned and used for the sexual gratification of her captor.
"Damn, i've gotta get me a cellargirl like those Austrian guys...they've got it made!"
by ElixirOfEvil September 03, 2008