This term is used to define a girl who has been with 5 or more Kappa Sigmas. It is crucial in using this term to make sure the "Tappa" has corraled over 5 brothers in her tenure. See other such terms to define ladies who have only begun their interest in KS's or have been with less than 5 in their career.
KS Bro #1: Hey man, did you know Lisa (fake name) hooked up with T. Scott yesterday?
KS Bro #2: Yeah man, doesn't that make 5?
KS Bro #3: Yeah Bro, she's an offical Kappa Tappa!