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Zone Ten Only. ZTO refers to woman whose looks are a 10 on a chart of 1 to 10, ten being the best.
GUY1 - I heard you went out last night. Meet any girls?

GUY2 - Ya I did. She was ZTO. All the guys were hitting on her when I got there but i got her attention and her number.
by BrownCheetah June 29, 2011
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