A term started by a group of friends at a lunch table, and was eventually spread to Imgflip by Larkspur, their Imgflip username. It's basically another way of saying choccy milk.
Lunch Lady: What would you like to drink with that?
Eater: Brown Calcium, please!
Lunch Lady: What is that?
Eater: Chocolate milk.
Eater: Brown Calcium, please!
Lunch Lady: What is that?
Eater: Chocolate milk.
by Larkspur15 February 20, 2021
Get the brown calciummug.