The act of underwater cunninglas often taking place when a girl is menstruating to avoid the mess. Can be performed anytime though as the feeling is much different for her and for him. A steady stream of bubblesrolling over the clitoris is very stimulating for most women.
I was blowing tuna in the bathtub becuase my girl was on the rag.
When you have sex with someone's mouth, put some tuna in there to get it to smell like a proper pussy and squirt in a bit of lemon to get them to pucker up nice and tight.
When someones shorts rise so high up their legs while sitting (or even standing..somehow) to the point where it is retardly awkward to those who are around this person. Pants as high to a point where you can practically see this persons boxers or balls.
Dennis: BumblebeeTuna! Man Minh I can see your balls, what the hell is going on here. Thats only for me to see.