Feed the fish

Noun. A sexual act, sprinkling powder on the clitoris prior to coitus.

Did you know that if you feed the fish it makes sex more intense?

Feeding fish at the blue lagoon.

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.

Fuck em and feed em to the fish

definition-
fuck them

quoted by Trenton T Curtin

Person 1: your friends are assholes.
Person 2: Fuck em and feed em to the fish.