good tuna

A metaphor to describe the quality or enjoyment of sexual activities with female, almost always but not necessarily involving the vagina.

Alternatively can be used to explain the pleasure of a meal.

*note: tuna can be changed to pork if describing sexual contact with a male.

Example 1:

Friend: Did you pull last night?
You: Yeah man!
Friend: How was it?
You: Let's just say it was good tuna

Example 2:
*During intercourse with a female*
Internally to self: Oh yeah, that's good tuna.