Misspelling of the name "Tina".
A Woman who is better than the average Tina. Therefore a second 'n' is added to the name signifying its superiority.
Contrary to popular belief, she is not the master of the universe. She is in fact a unicorn in disguise.
Oscar: "Oh dayum who's that chick?"
John: "I think her names Tina?"
Conrad: "Nah B. It's TINNA."
Oscar: "THE UNICORN?"
A shrewsburyism used in place of It Isn't.
Rob: Whats the weather like?
Jo: Ahh it tinna very nice.