Somebody who is serenatastic is female voluptuous, and curvaceous, and most likely hardbody.
Most often has superb badonkadonk and good cushion for the pushin.
On a scale of 1 to 37, she scores 40.
This word inspired by many women but mostly serena williams (38-28-44).
Sure, there are guys who disagree, but most grown men who are honest would think she is all of the above.
Freddy: I want a woman who is serenatastic!
Rest of the male population: Join the line.