A salmon fillet refers to the vagina of a young, well groomed, well maintained girl who’s pussy is a reflection of this...
The pussy has the look, feel and elasticity of a razor thin slit in a fresh salmon fillet that has been placed in the microwave for a period of 15 seconds (to become body temperature)
"Dude, I went out with this sick asian school girl last night"
"For real, how was the pussy?"
"salmon fillet motherfucker"