Lady Gills
Slang term for vagina, popular in British culture.
Oh man I went down on her for so long last night but luckily I was able to breath through her lady gills.
Lady gill
A lady gill is a term used for the private down below relm of a woman. Which has an uncanny resemblance to, you guessed it, a fish's gill.
Jesus Steve you should have seen sophies lady gill it almost swallowed me alive