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2.
(n)

The act of rubbing two unwashed vaginas together in a sexual manner.
Olga and Bethany were horny even though their water was shut off, so they decided to Tuna Fish Sandwich eachother.
by One Twenty7 January 22, 2011
 
1.
It is a form of Slang for Vagina
her cooch smells like a tuna fish sandwich
by tainted Bebop November 09, 2006
 
3.
A Rim Job
She gave him a tun fish sandwich instead of a blow job
by Ozzy October 03, 2003