A woman's vagina...also, it can be used to describe a smelly and/or dirty vagina.
"Hey hot stuff! Why dont u come over here and i'll have a tuna box for lunch!"
by Reesey December 10, 2002
1.) smells like tuna thats been baking in the hot sun all afternoon. 2.)a fish sandwich that was left in your car over the weekend and that smell that first hits your noise when you open door
whats that smell coming in from down there is must be a tunabox.
by dirty stank hoe September 08, 2010