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1.
A firm desire to finish sex, no matter how disgusting the girl may be.
John showed incredible tunacity while banging that 300 lb. walrus of a woman who simultaneously smelled like feces and rotten meat.
by The Broham November 23, 2011
 
2.
an offensive smell of a vagina.

brooke, your vagina smells like tuna city!
by Chamber Gina February 13, 2008