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1.
An adjective used to describe a length of hair, typically at the back of one's head, that can be tied into a ponytail.
My hair is almost long enough to be ponytailable; I think it will be in a month.
by StacyStacy October 12, 2010
 
2.
Hair that's long enought to pull back into a pony tail.
My friend Carol told my hair dresser she can cut off a decent amount of hair as long as it's still pony tailable.
by bennzz61 January 20, 2011