This is a euphemism for going to the toilet - the blue lagoon is reference to the use of blue tablets that colour the water in the toilet.
Sorry I was late, I was feeding fish at the blue lagoon.
When your girl puss is so dank, when you fill her up with dick sauce that shit turn green
"That girl I picked up on the street last night (hooker) was so ratchet I had to give her a green lagoon"
A wet soggy anus, typically after having major swamp ass or diarrhea.
my ass is so wet, its like a poop lagoon down there!
When you go Crap in a public bathroom and you are the first user and the water is still blue
I had to do my fsotd at a Mickey D’s and was lucky I was Dippin in the blue lagoon
Terror, sweat, trauma, pain, blood, tears. This is a catholic all-girls school in Satan's new and improved version of hell called Nigeria. This hell chamber was made to torture innocent, growing girls and it has done exactly that.
Girl 1: Did you graduate from The Lagoon School last year?
Girl 2: Yes o!
Girl 1: No wonder you had such a glow-up. That school is terrible!
Girl 2: Yes o my sister.
Lagoon Mouthwash-
When one person receiving oral, pisses down the throat of the person giving, and that person precedes to vomit up the piss onto the receiving person’s penis.
Person 1: It’s been a while since I’ve gotten Lagoon Mouthwashed.
Person 2: What’s that?
Person 1: Oh, oh buddy..
To sweat excessively in your nether region. Swamp Ass for female lady parts. (Male version: Niagara Balls)
Ryan: I am sweating my balls off.
Elyse: Yea I am really dealing with a poon lagoon.