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1.
when a vagina makes a farting noise.
It was aweful when that bitch let out a Tuna sneeze all up in my face.
by Sunshine168 February 06, 2008
 
2.
The act of sneezing while eating a tuna sandwich.
I was eating a tuna sandwich while driving one day, and I felt a sneeze coming on but I couldn't chew and swallow fast enough - Tuna Sneeze all over my windshield! Yuk! (True story)
by Free My Willie January 18, 2007