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1.
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?"

Conrad: "Yeah."
by Pavith Siva November 21, 2010
 
2.
A shrewsburyism used in place of It Isn't.
Rob: Whats the weather like?

Jo: Ahh it tinna very nice.
by Robert Leigh Adams December 01, 2006