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1.
When the hot girl at your work is over the age of 18.
Drew: Dude, Tessa that chick from work, is so hot! But I'm not sure how old she is.

Joe: Bro her 18th birthday was like last week.

Drew: Oh shit! That means she's Tapable!
by Jordan P. McClain February 05, 2009
 
3.
having characteristics of tap
sexy
pleasing appearence
cool
good
antonym:untapable
She is tapable.
Chester made the word tapable.
by Chester May 10, 2003