As Defined by UrbanDictionary.com:

JoHanna

generally a hot brunette with a killer body
usually refered to as a hottie wit a body
everyone loves her and wants to be with her or in her
she is modest but knows shes hot shit and can do and get whatever she wants.

eg:
Damnn, i wanna tap johanna' s ass

Johanna is Gods gift to mankind.

Johanna is perfect in everyway.
JoHannah "M.C. Vanilla" Sparkling - 15 years, 7 months, 7 days ago