Top Definition
Tuna Butter or TB, is the combination of anal sweat and vaginal secretions that forms a thick, creamy, white substance between the two. This vile mixture produces the unmistakable smell of putrid fish.
Hey Liz, don't forget to shower after you run, I don't need to smell that nasty ass Tuna Butter.
by NO TB for ME August 06, 2010

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