The loose lips of a well used vagina that have a unpleasant smell and or discoloration.
Hey Alfred that girl over there is the one I took home from the bar the other night: Her salmon flap was rather unpleasant, It left a bad taste in my mouth.
Salmon Flaps are the fishy Flaps
that you must spread, if you dare, to enter her fishy love hole
This phrase is commonly used when describing a skip holed whore who doesn't wash properly. The smell, when she opens her legs can make a man faint if he goes down on her. Even when wearing jeans she is often told to 'CLOSE YOUR LEGS LOVE!'.
This phrase can be used in many circumstances, but this is the most common.
Person 1: Did you fuck Steph last night?
Person 2: Yeah mate, I fucked that whore good, but her Salmon Flaps nearly ate me whole. Boy was she smelly! Like a Salmon.