Based on the 1980 movie "The Blue Lagoon".

The ability of any two people to fall in love when there is no one else available.

Also the ability of the only person in a group of a certain gender to become the object of desire for the rest.

See also: proximity infatuation
A: "So how did you two get married?"
B: "Completely Blue Lagoon Syndrome. We were stranded in an elevator together over Christmas Break, so it was inevitable."

A: "I don't get it, everybody at work thinks Suzi is such a babe!"
B: "Dude, Suzi is the *only* female in your office, of course they think she's hot, it's Blue Lagoon Syndrome!"
by Conrad Zero April 28, 2008
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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.
by Theodore H Biscuit October 12, 2010
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When a women takes laxatives before engaging in anal, spraying poop on the wall.
David: Hey Todd, how can I show Lisa how much I love her?
Todd: give her a blue lagoon!
by November 7, 2018
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An alcoholic drink that consist of: 1 part coconut rum, 1 part of Blue Caracao, and 6 parts lemon juice or sour mix.

For best results, get a shaker, and a handful of ice in it, then mix the rum, blue caracao, and then the juice. Shake, and pour into a chilled glass. Pineapple, Lemon, Lime or Orange garnish.

Just a couple of notes: 1 part = 1 oz, I prefer to use Barcardi coconut rum if you want it to be stronger or Malibu if you want more flavor. In my Opinion it's an excellent summer cocktail, you can get a nice buzz off a couple, by a nice body of water, it tastes like Blue Coconut shaved ice to me, I love it.
It's quite hot outside, I think I'll go make some Blue Lagoons to cool off, and unwind in the summertime.
by Alangrae June 16, 2018
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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
by John from OP May 25, 2021
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